diff --git a/drm/mediadrm/plugins/clearkey/hidl/DrmPlugin.cpp b/drm/mediadrm/plugins/clearkey/hidl/DrmPlugin.cpp
index aab475e..546eb3e 100644
--- a/drm/mediadrm/plugins/clearkey/hidl/DrmPlugin.cpp
+++ b/drm/mediadrm/plugins/clearkey/hidl/DrmPlugin.cpp
@@ -111,6 +111,8 @@
 // The content in this secure stop is implementation dependent, the clearkey
 // secureStop does not serve as a reference implementation.
 void DrmPlugin::installSecureStop(const hidl_vec<uint8_t>& sessionId) {
+    Mutex::Autolock lock(mSecureStopLock);
+
     ClearkeySecureStop clearkeySecureStop;
     clearkeySecureStop.id = uint32ToVector(++mNextSecureStopId);
     clearkeySecureStop.data.assign(sessionId.begin(), sessionId.end());
@@ -744,6 +746,7 @@
 }
 
 Return<void> DrmPlugin::getSecureStops(getSecureStops_cb _hidl_cb) {
+    mSecureStopLock.lock();
     std::vector<SecureStop> stops;
     for (auto itr = mSecureStops.begin(); itr != mSecureStops.end(); ++itr) {
         ClearkeySecureStop clearkeyStop = itr->second;
@@ -755,26 +758,32 @@
         stop.opaqueData = toHidlVec(stopVec);
         stops.push_back(stop);
     }
+    mSecureStopLock.unlock();
+
     _hidl_cb(Status::OK, stops);
     return Void();
 }
 
 Return<void> DrmPlugin::getSecureStop(const hidl_vec<uint8_t>& secureStopId,
         getSecureStop_cb _hidl_cb) {
-    SecureStop stop;
+    std::vector<uint8_t> stopVec;
+
+    mSecureStopLock.lock();
     auto itr = mSecureStops.find(toVector(secureStopId));
     if (itr != mSecureStops.end()) {
         ClearkeySecureStop clearkeyStop = itr->second;
-        std::vector<uint8_t> stopVec;
         stopVec.insert(stopVec.end(), clearkeyStop.id.begin(), clearkeyStop.id.end());
         stopVec.insert(stopVec.end(), clearkeyStop.data.begin(), clearkeyStop.data.end());
+    }
+    mSecureStopLock.unlock();
 
+    SecureStop stop;
+    if (!stopVec.empty()) {
         stop.opaqueData = toHidlVec(stopVec);
         _hidl_cb(Status::OK, stop);
     } else {
         _hidl_cb(Status::BAD_VALUE, stop);
     }
-
     return Void();
 }
 
@@ -787,10 +796,12 @@
 }
 
 Return<void> DrmPlugin::getSecureStopIds(getSecureStopIds_cb _hidl_cb) {
+    mSecureStopLock.lock();
     std::vector<SecureStopId> ids;
     for (auto itr = mSecureStops.begin(); itr != mSecureStops.end(); ++itr) {
         ids.push_back(itr->first);
     }
+    mSecureStopLock.unlock();
 
     _hidl_cb(Status::OK, toHidlVec(ids));
     return Void();
@@ -856,6 +867,8 @@
 }
 
 Return<Status> DrmPlugin::removeSecureStop(const hidl_vec<uint8_t>& secureStopId) {
+    Mutex::Autolock lock(mSecureStopLock);
+
     if (1 != mSecureStops.erase(toVector(secureStopId))) {
         return Status::BAD_VALUE;
     }
@@ -863,6 +876,8 @@
 }
 
 Return<Status> DrmPlugin::removeAllSecureStops() {
+    Mutex::Autolock lock(mSecureStopLock);
+
     mSecureStops.clear();
     mNextSecureStopId = kSecureStopIdStart;
     return Status::OK;
diff --git a/drm/mediadrm/plugins/clearkey/hidl/include/DrmPlugin.h b/drm/mediadrm/plugins/clearkey/hidl/include/DrmPlugin.h
index f294d4d..3de7589 100644
--- a/drm/mediadrm/plugins/clearkey/hidl/include/DrmPlugin.h
+++ b/drm/mediadrm/plugins/clearkey/hidl/include/DrmPlugin.h
@@ -416,6 +416,7 @@
     }
 
     DeviceFiles mFileHandle;
+    Mutex mSecureStopLock;
 
     CLEARKEY_DISALLOW_COPY_AND_ASSIGN_AND_NEW(DrmPlugin);
 };
diff --git a/media/codec2/sfplugin/CCodecBuffers.cpp b/media/codec2/sfplugin/CCodecBuffers.cpp
index 26c702d..ed8b832 100644
--- a/media/codec2/sfplugin/CCodecBuffers.cpp
+++ b/media/codec2/sfplugin/CCodecBuffers.cpp
@@ -878,9 +878,10 @@
     switch (c2buffer->data().type()) {
         case C2BufferData::LINEAR: {
             uint32_t size = kLinearBufferSize;
-            const C2ConstLinearBlock &block = c2buffer->data().linearBlocks().front();
-            if (block.size() < kMaxLinearBufferSize / 2) {
-                size = block.size() * 2;
+            const std::vector<C2ConstLinearBlock> &linear_blocks = c2buffer->data().linearBlocks();
+            const uint32_t block_size = linear_blocks.front().size();
+            if (block_size < kMaxLinearBufferSize / 2) {
+                size = block_size * 2;
             } else {
                 size = kMaxLinearBufferSize;
             }
diff --git a/media/extractors/midi/Android.bp b/media/extractors/midi/Android.bp
index 7d42e70..91ce78e 100644
--- a/media/extractors/midi/Android.bp
+++ b/media/extractors/midi/Android.bp
@@ -14,7 +14,9 @@
     static_libs: [
         "libmedia_midiiowrapper",
         "libsonivox",
-        "libstagefright_foundation"
+        "libstagefright_foundation",
+        "libwatchdog",
+        "libbase",
     ],
     name: "libmidiextractor",
     relative_install_path: "extractors",
@@ -35,5 +37,4 @@
             "signed-integer-overflow",
         ],
     },
-
 }
diff --git a/media/extractors/midi/MidiExtractor.cpp b/media/extractors/midi/MidiExtractor.cpp
index 9f4f9e6..d0efb2f 100644
--- a/media/extractors/midi/MidiExtractor.cpp
+++ b/media/extractors/midi/MidiExtractor.cpp
@@ -26,6 +26,7 @@
 #include <media/stagefright/MediaDefs.h>
 #include <media/stagefright/MediaErrors.h>
 #include <libsonivox/eas_reverb.h>
+#include <watchdog/Watchdog.h>
 
 namespace android {
 
@@ -116,6 +117,7 @@
         MediaBufferHelper **outBuffer, const ReadOptions *options)
 {
     ALOGV("MidiSource::read");
+
     MediaBufferHelper *buffer;
     // process an optional seek request
     int64_t seekTimeUs;
@@ -139,6 +141,8 @@
 }
 
 // MidiEngine
+using namespace std::chrono_literals;
+static constexpr auto kTimeout = 10s;
 
 MidiEngine::MidiEngine(CDataSource *dataSource,
         AMediaFormat *fileMetadata,
@@ -147,6 +151,8 @@
             mEasHandle(NULL),
             mEasConfig(NULL),
             mIsInitialized(false) {
+    Watchdog watchdog(kTimeout);
+
     mIoWrapper = new MidiIoWrapper(dataSource);
     // spin up a new EAS engine
     EAS_I32 temp;
@@ -186,6 +192,8 @@
 }
 
 MidiEngine::~MidiEngine() {
+    Watchdog watchdog(kTimeout);
+
     if (mEasHandle) {
         EAS_CloseFile(mEasData, mEasHandle);
     }
@@ -217,12 +225,16 @@
 }
 
 status_t MidiEngine::seekTo(int64_t positionUs) {
+    Watchdog watchdog(kTimeout);
+
     ALOGV("seekTo %lld", (long long)positionUs);
     EAS_RESULT result = EAS_Locate(mEasData, mEasHandle, positionUs / 1000, false);
     return result == EAS_SUCCESS ? OK : UNKNOWN_ERROR;
 }
 
 MediaBufferHelper* MidiEngine::readBuffer() {
+    Watchdog watchdog(kTimeout);
+
     EAS_STATE state;
     EAS_State(mEasData, mEasHandle, &state);
     if ((state == EAS_STATE_STOPPED) || (state == EAS_STATE_ERROR)) {
diff --git a/media/extractors/mp4/MPEG4Extractor.cpp b/media/extractors/mp4/MPEG4Extractor.cpp
index 14fe0dc..fa562f3 100755
--- a/media/extractors/mp4/MPEG4Extractor.cpp
+++ b/media/extractors/mp4/MPEG4Extractor.cpp
@@ -4993,8 +4993,11 @@
 }
 
 status_t MPEG4Source::parseSampleAuxiliaryInformationSizes(
-        off64_t offset, off64_t /* size */) {
+        off64_t offset, off64_t size) {
     ALOGV("parseSampleAuxiliaryInformationSizes");
+    if (size < 9) {
+        return -EINVAL;
+    }
     // 14496-12 8.7.12
     uint8_t version;
     if (mDataSource->readAt(
@@ -5007,25 +5010,32 @@
         return ERROR_UNSUPPORTED;
     }
     offset++;
+    size--;
 
     uint32_t flags;
     if (!mDataSource->getUInt24(offset, &flags)) {
         return ERROR_IO;
     }
     offset += 3;
+    size -= 3;
 
     if (flags & 1) {
+        if (size < 13) {
+            return -EINVAL;
+        }
         uint32_t tmp;
         if (!mDataSource->getUInt32(offset, &tmp)) {
             return ERROR_MALFORMED;
         }
         mCurrentAuxInfoType = tmp;
         offset += 4;
+        size -= 4;
         if (!mDataSource->getUInt32(offset, &tmp)) {
             return ERROR_MALFORMED;
         }
         mCurrentAuxInfoTypeParameter = tmp;
         offset += 4;
+        size -= 4;
     }
 
     uint8_t defsize;
@@ -5034,6 +5044,7 @@
     }
     mCurrentDefaultSampleInfoSize = defsize;
     offset++;
+    size--;
 
     uint32_t smplcnt;
     if (!mDataSource->getUInt32(offset, &smplcnt)) {
@@ -5041,11 +5052,16 @@
     }
     mCurrentSampleInfoCount = smplcnt;
     offset += 4;
-
+    size -= 4;
     if (mCurrentDefaultSampleInfoSize != 0) {
         ALOGV("@@@@ using default sample info size of %d", mCurrentDefaultSampleInfoSize);
         return OK;
     }
+    if(smplcnt > size) {
+        ALOGW("b/124525515 - smplcnt(%u) > size(%ld)", (unsigned int)smplcnt, (unsigned long)size);
+        android_errorWriteLog(0x534e4554, "124525515");
+        return -EINVAL;
+    }
     if (smplcnt > mCurrentSampleInfoAllocSize) {
         uint8_t * newPtr =  (uint8_t*) realloc(mCurrentSampleInfoSizes, smplcnt);
         if (newPtr == NULL) {
@@ -5061,26 +5077,32 @@
 }
 
 status_t MPEG4Source::parseSampleAuxiliaryInformationOffsets(
-        off64_t offset, off64_t /* size */) {
+        off64_t offset, off64_t size) {
     ALOGV("parseSampleAuxiliaryInformationOffsets");
+    if (size < 8) {
+        return -EINVAL;
+    }
     // 14496-12 8.7.13
     uint8_t version;
     if (mDataSource->readAt(offset, &version, sizeof(version)) != 1) {
         return ERROR_IO;
     }
     offset++;
+    size--;
 
     uint32_t flags;
     if (!mDataSource->getUInt24(offset, &flags)) {
         return ERROR_IO;
     }
     offset += 3;
+    size -= 3;
 
     uint32_t entrycount;
     if (!mDataSource->getUInt32(offset, &entrycount)) {
         return ERROR_IO;
     }
     offset += 4;
+    size -= 4;
     if (entrycount == 0) {
         return OK;
     }
@@ -5106,19 +5128,31 @@
 
     for (size_t i = 0; i < entrycount; i++) {
         if (version == 0) {
+            if (size < 4) {
+                ALOGW("b/124526959");
+                android_errorWriteLog(0x534e4554, "124526959");
+                return -EINVAL;
+            }
             uint32_t tmp;
             if (!mDataSource->getUInt32(offset, &tmp)) {
                 return ERROR_IO;
             }
             mCurrentSampleInfoOffsets[i] = tmp;
             offset += 4;
+            size -= 4;
         } else {
+            if (size < 8) {
+                ALOGW("b/124526959");
+                android_errorWriteLog(0x534e4554, "124526959");
+                return -EINVAL;
+            }
             uint64_t tmp;
             if (!mDataSource->getUInt64(offset, &tmp)) {
                 return ERROR_IO;
             }
             mCurrentSampleInfoOffsets[i] = tmp;
             offset += 8;
+            size -= 8;
         }
     }
 
diff --git a/media/extractors/mp4/SampleTable.cpp b/media/extractors/mp4/SampleTable.cpp
index bf29bf1..e7e8901 100644
--- a/media/extractors/mp4/SampleTable.cpp
+++ b/media/extractors/mp4/SampleTable.cpp
@@ -391,20 +391,11 @@
     }
 
     mTimeToSampleCount = U32_AT(&header[4]);
-    if (mTimeToSampleCount > UINT32_MAX / (2 * sizeof(uint32_t))) {
-        // Choose this bound because
-        // 1) 2 * sizeof(uint32_t) is the amount of memory needed for one
-        //    time-to-sample entry in the time-to-sample table.
-        // 2) mTimeToSampleCount is the number of entries of the time-to-sample
-        //    table.
-        // 3) We hope that the table size does not exceed UINT32_MAX.
+    if (mTimeToSampleCount > (data_size - 8) / (2 * sizeof(uint32_t))) {
         ALOGE("Time-to-sample table size too large.");
         return ERROR_OUT_OF_RANGE;
     }
 
-    // Note: At this point, we know that mTimeToSampleCount * 2 will not
-    // overflow because of the above condition.
-
     uint64_t allocSize = (uint64_t)mTimeToSampleCount * 2 * sizeof(uint32_t);
     mTotalSize += allocSize;
     if (mTotalSize > kMaxTotalSize) {
@@ -540,6 +531,12 @@
     }
 
     uint64_t allocSize = (uint64_t)numSyncSamples * sizeof(uint32_t);
+    if (allocSize > data_size - 8) {
+        ALOGW("b/124771364 - allocSize(%lu) > size(%lu)",
+                (unsigned long)allocSize, (unsigned long)(data_size - 8));
+        android_errorWriteLog(0x534e4554, "124771364");
+        return ERROR_MALFORMED;
+    }
     if (allocSize > kMaxTotalSize) {
         ALOGE("Sync sample table size too large.");
         return ERROR_OUT_OF_RANGE;
diff --git a/media/libaaudio/src/binding/IAAudioService.cpp b/media/libaaudio/src/binding/IAAudioService.cpp
index 97ad2b0..e017b3a 100644
--- a/media/libaaudio/src/binding/IAAudioService.cpp
+++ b/media/libaaudio/src/binding/IAAudioService.cpp
@@ -237,12 +237,12 @@
 
 status_t BnAAudioService::onTransact(uint32_t code, const Parcel& data,
                                         Parcel* reply, uint32_t flags) {
-    aaudio_handle_t streamHandle;
+    aaudio_handle_t streamHandle = 0;
     aaudio::AAudioStreamRequest request;
     aaudio::AAudioStreamConfiguration configuration;
-    pid_t tid;
-    int64_t nanoseconds;
-    aaudio_result_t result;
+    pid_t tid = 0;
+    int64_t nanoseconds = 0;
+    aaudio_result_t result = AAUDIO_OK;
     status_t status = NO_ERROR;
     ALOGV("BnAAudioService::onTransact(%i) %i", code, flags);
 
@@ -285,7 +285,11 @@
 
         case CLOSE_STREAM: {
             CHECK_INTERFACE(IAAudioService, data, reply);
-            data.readInt32(&streamHandle);
+            status = data.readInt32(&streamHandle);
+            if (status != NO_ERROR) {
+                ALOGE("BnAAudioService::%s(CLOSE_STREAM) streamHandle failed!", __func__);
+                return status;
+            }
             result = closeStream(streamHandle);
             //ALOGD("BnAAudioService::onTransact CLOSE_STREAM 0x%08X, result = %d",
             //      streamHandle, result);
@@ -297,6 +301,7 @@
             CHECK_INTERFACE(IAAudioService, data, reply);
             status = data.readInt32(&streamHandle);
             if (status != NO_ERROR) {
+                ALOGE("BnAAudioService::%s(GET_STREAM_DESCRIPTION) streamHandle failed!", __func__);
                 return status;
             }
             aaudio::AudioEndpointParcelable parcelable;
@@ -313,7 +318,11 @@
 
         case START_STREAM: {
             CHECK_INTERFACE(IAAudioService, data, reply);
-            data.readInt32(&streamHandle);
+            status = data.readInt32(&streamHandle);
+            if (status != NO_ERROR) {
+                ALOGE("BnAAudioService::%s(START_STREAM) streamHandle failed!", __func__);
+                return status;
+            }
             result = startStream(streamHandle);
             ALOGV("BnAAudioService::onTransact START_STREAM 0x%08X, result = %d",
                     streamHandle, result);
@@ -323,7 +332,11 @@
 
         case PAUSE_STREAM: {
             CHECK_INTERFACE(IAAudioService, data, reply);
-            data.readInt32(&streamHandle);
+            status = data.readInt32(&streamHandle);
+            if (status != NO_ERROR) {
+                ALOGE("BnAAudioService::%s(PAUSE_STREAM) streamHandle failed!", __func__);
+                return status;
+            }
             result = pauseStream(streamHandle);
             ALOGV("BnAAudioService::onTransact PAUSE_STREAM 0x%08X, result = %d",
                   streamHandle, result);
@@ -333,7 +346,11 @@
 
         case STOP_STREAM: {
             CHECK_INTERFACE(IAAudioService, data, reply);
-            data.readInt32(&streamHandle);
+            status = data.readInt32(&streamHandle);
+            if (status != NO_ERROR) {
+                ALOGE("BnAAudioService::%s(STOP_STREAM) streamHandle failed!", __func__);
+                return status;
+            }
             result = stopStream(streamHandle);
             ALOGV("BnAAudioService::onTransact STOP_STREAM 0x%08X, result = %d",
                   streamHandle, result);
@@ -343,7 +360,11 @@
 
         case FLUSH_STREAM: {
             CHECK_INTERFACE(IAAudioService, data, reply);
-            data.readInt32(&streamHandle);
+            status = data.readInt32(&streamHandle);
+            if (status != NO_ERROR) {
+                ALOGE("BnAAudioService::%s(FLUSH_STREAM) streamHandle failed!", __func__);
+                return status;
+            }
             result = flushStream(streamHandle);
             ALOGV("BnAAudioService::onTransact FLUSH_STREAM 0x%08X, result = %d",
                     streamHandle, result);
@@ -353,20 +374,40 @@
 
         case REGISTER_AUDIO_THREAD: {
             CHECK_INTERFACE(IAAudioService, data, reply);
-            data.readInt32(&streamHandle);
-            data.readInt32(&tid);
-            data.readInt64(&nanoseconds);
+            status = data.readInt32(&streamHandle);
+            if (status != NO_ERROR) {
+                ALOGE("BnAAudioService::%s(REGISTER_AUDIO_THREAD) streamHandle failed!", __func__);
+                return status;
+            }
+            status = data.readInt32(&tid);
+            if (status != NO_ERROR) {
+                ALOGE("BnAAudioService::%s(REGISTER_AUDIO_THREAD) tid failed!", __func__);
+                return status;
+            }
+            status = data.readInt64(&nanoseconds);
+            if (status != NO_ERROR) {
+                ALOGE("BnAAudioService::%s(REGISTER_AUDIO_THREAD) nanoseconds failed!", __func__);
+                return status;
+            }
             result = registerAudioThread(streamHandle, tid, nanoseconds);
-            ALOGV("BnAAudioService::onTransact REGISTER_AUDIO_THREAD 0x%08X, result = %d",
-                    streamHandle, result);
+            ALOGV("BnAAudioService::%s(REGISTER_AUDIO_THREAD) 0x%08X, result = %d",
+                    __func__, streamHandle, result);
             reply->writeInt32(result);
             return NO_ERROR;
         } break;
 
         case UNREGISTER_AUDIO_THREAD: {
             CHECK_INTERFACE(IAAudioService, data, reply);
-            data.readInt32(&streamHandle);
-            data.readInt32(&tid);
+            status = data.readInt32(&streamHandle);
+            if (status != NO_ERROR) {
+                ALOGE("BnAAudioService::%s(UNREGISTER_AUDIO_THREAD) streamHandle failed!", __func__);
+                return status;
+            }
+            status = data.readInt32(&tid);
+            if (status != NO_ERROR) {
+                ALOGE("BnAAudioService::%s(UNREGISTER_AUDIO_THREAD) tid failed!", __func__);
+                return status;
+            }
             result = unregisterAudioThread(streamHandle, tid);
             ALOGV("BnAAudioService::onTransact UNREGISTER_AUDIO_THREAD 0x%08X, result = %d",
                     streamHandle, result);
diff --git a/media/libaudioclient/AudioRecord.cpp b/media/libaudioclient/AudioRecord.cpp
index a1b04ca..271e186 100644
--- a/media/libaudioclient/AudioRecord.cpp
+++ b/media/libaudioclient/AudioRecord.cpp
@@ -884,7 +884,6 @@
 {
     // previous and new IAudioRecord sequence numbers are used to detect track re-creation
     uint32_t oldSequence = 0;
-    uint32_t newSequence;
 
     Proxy::Buffer buffer;
     status_t status = NO_ERROR;
@@ -902,7 +901,7 @@
             // start of lock scope
             AutoMutex lock(mLock);
 
-            newSequence = mSequence;
+            uint32_t newSequence = mSequence;
             // did previous obtainBuffer() fail due to media server death or voluntary invalidation?
             if (status == DEAD_OBJECT) {
                 // re-create track, unless someone else has already done so
@@ -939,6 +938,7 @@
     audioBuffer->frameCount = buffer.mFrameCount;
     audioBuffer->size = buffer.mFrameCount * mFrameSize;
     audioBuffer->raw = buffer.mRaw;
+    audioBuffer->sequence = oldSequence;
     if (nonContig != NULL) {
         *nonContig = buffer.mNonContig;
     }
@@ -959,6 +959,12 @@
     buffer.mRaw = audioBuffer->raw;
 
     AutoMutex lock(mLock);
+    if (audioBuffer->sequence != mSequence) {
+        // This Buffer came from a different IAudioRecord instance, so ignore the releaseBuffer
+        ALOGD("%s is no-op due to IAudioRecord sequence mismatch %u != %u",
+                __func__, audioBuffer->sequence, mSequence);
+        return;
+    }
     mInOverrun = false;
     mProxy->releaseBuffer(&buffer);
 
diff --git a/media/libaudioclient/AudioTrack.cpp b/media/libaudioclient/AudioTrack.cpp
index 4a80cd3..9a66d48 100644
--- a/media/libaudioclient/AudioTrack.cpp
+++ b/media/libaudioclient/AudioTrack.cpp
@@ -1665,7 +1665,6 @@
 {
     // previous and new IAudioTrack sequence numbers are used to detect track re-creation
     uint32_t oldSequence = 0;
-    uint32_t newSequence;
 
     Proxy::Buffer buffer;
     status_t status = NO_ERROR;
@@ -1682,7 +1681,7 @@
         {   // start of lock scope
             AutoMutex lock(mLock);
 
-            newSequence = mSequence;
+            uint32_t newSequence = mSequence;
             // did previous obtainBuffer() fail due to media server death or voluntary invalidation?
             if (status == DEAD_OBJECT) {
                 // re-create track, unless someone else has already done so
@@ -1729,6 +1728,7 @@
     audioBuffer->frameCount = buffer.mFrameCount;
     audioBuffer->size = buffer.mFrameCount * mFrameSize;
     audioBuffer->raw = buffer.mRaw;
+    audioBuffer->sequence = oldSequence;
     if (nonContig != NULL) {
         *nonContig = buffer.mNonContig;
     }
@@ -1752,6 +1752,12 @@
     buffer.mRaw = audioBuffer->raw;
 
     AutoMutex lock(mLock);
+    if (audioBuffer->sequence != mSequence) {
+        // This Buffer came from a different IAudioTrack instance, so ignore the releaseBuffer
+        ALOGD("%s is no-op due to IAudioTrack sequence mismatch %u != %u",
+                __func__, audioBuffer->sequence, mSequence);
+        return;
+    }
     mReleased += stepCount;
     mInUnderrun = false;
     mProxy->releaseBuffer(&buffer);
diff --git a/media/libaudioclient/include/media/AudioRecord.h b/media/libaudioclient/include/media/AudioRecord.h
index a3c0fe4..574302b 100644
--- a/media/libaudioclient/include/media/AudioRecord.h
+++ b/media/libaudioclient/include/media/AudioRecord.h
@@ -92,6 +92,11 @@
             int8_t*     i8;         // unsigned 8-bit, offset by 0x80
                                     // input to obtainBuffer(): unused, output: pointer to buffer
         };
+
+        uint32_t    sequence;       // IAudioRecord instance sequence number, as of obtainBuffer().
+                                    // It is set by obtainBuffer() and confirmed by releaseBuffer().
+                                    // Not "user-serviceable".
+                                    // TODO Consider sp<IMemory> instead, or in addition to this.
     };
 
     /* As a convenience, if a callback is supplied, a handler thread
@@ -420,14 +425,17 @@
      *  frameCount  number of frames requested
      *  size        ignored
      *  raw         ignored
+     *  sequence    ignored
      * After error return:
      *  frameCount  0
      *  size        0
      *  raw         undefined
+     *  sequence    undefined
      * After successful return:
      *  frameCount  actual number of frames available, <= number requested
      *  size        actual number of bytes available
      *  raw         pointer to the buffer
+     *  sequence    IAudioRecord instance sequence number, as of obtainBuffer()
      */
 
             status_t    obtainBuffer(Buffer* audioBuffer, int32_t waitCount,
diff --git a/media/libaudioclient/include/media/AudioTrack.h b/media/libaudioclient/include/media/AudioTrack.h
index df5eabc..c607918 100644
--- a/media/libaudioclient/include/media/AudioTrack.h
+++ b/media/libaudioclient/include/media/AudioTrack.h
@@ -107,6 +107,11 @@
             int16_t*    i16;      // signed 16-bit
             int8_t*     i8;       // unsigned 8-bit, offset by 0x80
         };                        // input to obtainBuffer(): unused, output: pointer to buffer
+
+        uint32_t    sequence;       // IAudioTrack instance sequence number, as of obtainBuffer().
+                                    // It is set by obtainBuffer() and confirmed by releaseBuffer().
+                                    // Not "user-serviceable".
+                                    // TODO Consider sp<IMemory> instead, or in addition to this.
     };
 
     /* As a convenience, if a callback is supplied, a handler thread
@@ -692,14 +697,17 @@
      *  frameCount  number of [empty slots for] frames requested
      *  size        ignored
      *  raw         ignored
+     *  sequence    ignored
      * After error return:
      *  frameCount  0
      *  size        0
      *  raw         undefined
+     *  sequence    undefined
      * After successful return:
      *  frameCount  actual number of [empty slots for] frames available, <= number requested
      *  size        actual number of bytes available
      *  raw         pointer to the buffer
+     *  sequence    IAudioTrack instance sequence number, as of obtainBuffer()
      */
             status_t    obtainBuffer(Buffer* audioBuffer, int32_t waitCount,
                                 size_t *nonContig = NULL);
diff --git a/media/libstagefright/foundation/OpusHeader.cpp b/media/libstagefright/foundation/OpusHeader.cpp
index 513e41f..f5687e0 100644
--- a/media/libstagefright/foundation/OpusHeader.cpp
+++ b/media/libstagefright/foundation/OpusHeader.cpp
@@ -292,6 +292,10 @@
         *opusHeadSize = data_size;
         return true;
     } else if (memcmp(AOPUS_CSD_MARKER_PREFIX, data, AOPUS_CSD_MARKER_PREFIX_SIZE) == 0) {
+        if (data_size < AOPUS_UNIFIED_CSD_MINSIZE || data_size > AOPUS_UNIFIED_CSD_MAXSIZE) {
+            ALOGD("Unexpected size for unified opus csd %zu", data_size);
+            return false;
+        }
         size_t i = 0;
         bool found = false;
         while (i <= data_size - AOPUS_MARKER_SIZE - AOPUS_LENGTH_SIZE) {
diff --git a/media/libwatchdog/Android.bp b/media/libwatchdog/Android.bp
new file mode 100644
index 0000000..2bdf172
--- /dev/null
+++ b/media/libwatchdog/Android.bp
@@ -0,0 +1,35 @@
+// Copyright 2020 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+cc_library {
+    name: "libwatchdog",
+    srcs: [
+        "Watchdog.cpp",
+    ],
+    export_include_dirs: ["include"],
+    shared_libs: [
+        "liblog",
+    ],
+    static_libs: [
+        "libbase",
+    ],
+    target: {
+        windows: {
+            enabled: false,
+        },
+        darwin: {
+            enabled: false,
+        },
+    },
+}
diff --git a/media/libwatchdog/Watchdog.cpp b/media/libwatchdog/Watchdog.cpp
new file mode 100644
index 0000000..bb012b9
--- /dev/null
+++ b/media/libwatchdog/Watchdog.cpp
@@ -0,0 +1,63 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "Watchdog"
+
+#include <watchdog/Watchdog.h>
+
+#include <android-base/logging.h>
+#include <android-base/threads.h>
+#include <signal.h>
+#include <time.h>
+#include <cstring>
+#include <utils/Log.h>
+
+namespace android {
+
+Watchdog::Watchdog(::std::chrono::steady_clock::duration timeout) {
+    // Create the timer.
+    struct sigevent sev;
+    sev.sigev_notify = SIGEV_THREAD_ID;
+    sev.sigev_notify_thread_id = base::GetThreadId();
+    sev.sigev_signo = SIGABRT;
+    sev.sigev_value.sival_ptr = &mTimerId;
+    int err = timer_create(CLOCK_MONOTONIC, &sev, &mTimerId);
+    if (err != 0) {
+        PLOG(FATAL) << "Failed to create timer";
+    }
+
+    // Start the timer.
+    struct itimerspec spec;
+    memset(&spec, 0, sizeof(spec));
+    auto ns = std::chrono::duration_cast<std::chrono::nanoseconds>(timeout);
+    LOG_ALWAYS_FATAL_IF(timeout.count() <= 0, "Duration must be positive");
+    spec.it_value.tv_sec = ns.count() / 1000000000;
+    spec.it_value.tv_nsec = ns.count() % 1000000000;
+    err = timer_settime(mTimerId, 0, &spec, nullptr);
+    if (err != 0) {
+        PLOG(FATAL) << "Failed to start timer";
+    }
+}
+
+Watchdog::~Watchdog() {
+    // Delete the timer.
+    int err = timer_delete(mTimerId);
+    if (err != 0) {
+        PLOG(FATAL) << "Failed to delete timer";
+    }
+}
+
+}  // namespace android
diff --git a/media/libwatchdog/include/watchdog/Watchdog.h b/media/libwatchdog/include/watchdog/Watchdog.h
new file mode 100644
index 0000000..2819f8a
--- /dev/null
+++ b/media/libwatchdog/include/watchdog/Watchdog.h
@@ -0,0 +1,49 @@
+/*
+ * Copyright (C) 2020 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_WATCHDOG_H
+#define ANDROID_WATCHDOG_H
+
+#include <chrono>
+#include <time.h>
+
+namespace android {
+
+/*
+ * An RAII-style object, which would crash the process if a timeout expires
+ * before the object is destroyed.
+ * The calling thread would be sent a SIGABORT, which would typically result in
+ * a stack trace.
+ *
+ * Sample usage:
+ * {
+ *     Watchdog watchdog(std::chrono::milliseconds(10));
+ *     DoSomething();
+ * }
+ * // If we got here, the function completed in time.
+ */
+class Watchdog final {
+public:
+    Watchdog(std::chrono::steady_clock::duration timeout);
+    ~Watchdog();
+
+private:
+    timer_t mTimerId;
+};
+
+}  // namespace android
+
+#endif  // ANDROID_WATCHDOG_H
diff --git a/media/mtp/MtpServer.cpp b/media/mtp/MtpServer.cpp
index ca8cb78..dd69496 100644
--- a/media/mtp/MtpServer.cpp
+++ b/media/mtp/MtpServer.cpp
@@ -44,6 +44,7 @@
 #include "MtpStringBuffer.h"
 
 namespace android {
+static const int SN_EVENT_LOG_ID = 0x534e4554;
 
 static const MtpOperationCode kSupportedOperationCodes[] = {
     MTP_OPERATION_GET_DEVICE_INFO,
@@ -961,6 +962,17 @@
     if (!parseDateTime(modified, modifiedTime))
         modifiedTime = 0;
 
+    if ((strcmp(name, ".") == 0) || (strcmp(name, "..") == 0) ||
+        (strchr(name, '/') != NULL)) {
+        char errMsg[80];
+
+        snprintf(errMsg, sizeof(errMsg), "Invalid name: %s", (const char *) name);
+        ALOGE("%s (b/130656917)", errMsg);
+        android_errorWriteWithInfoLog(SN_EVENT_LOG_ID, "130656917", -1, errMsg,
+                                      strlen(errMsg));
+
+        return MTP_RESPONSE_INVALID_PARAMETER;
+    }
     if (path[path.size() - 1] != '/')
         path.append("/");
     path.append(name);
diff --git a/services/mediaextractor/seccomp_policy/mediaextractor-arm.policy b/services/mediaextractor/seccomp_policy/mediaextractor-arm.policy
index 38f9be6..118072e 100644
--- a/services/mediaextractor/seccomp_policy/mediaextractor-arm.policy
+++ b/services/mediaextractor/seccomp_policy/mediaextractor-arm.policy
@@ -41,6 +41,9 @@
 getgroups32: 1
 nanosleep: 1
 getrandom: 1
+timer_create: 1
+timer_settime: 1
+timer_delete: 1
 
 # for dynamically loading extractors
 pread64: 1
diff --git a/services/mediaextractor/seccomp_policy/mediaextractor-arm64.policy b/services/mediaextractor/seccomp_policy/mediaextractor-arm64.policy
index 8fd8787..481e29e 100644
--- a/services/mediaextractor/seccomp_policy/mediaextractor-arm64.policy
+++ b/services/mediaextractor/seccomp_policy/mediaextractor-arm64.policy
@@ -30,6 +30,9 @@
 getrlimit: 1
 nanosleep: 1
 getrandom: 1
+timer_create: 1
+timer_settime: 1
+timer_delete: 1
 
 # for FileSource
 readlinkat: 1
diff --git a/services/mediaextractor/seccomp_policy/mediaextractor-x86.policy b/services/mediaextractor/seccomp_policy/mediaextractor-x86.policy
index 05915d1..15fb24e 100644
--- a/services/mediaextractor/seccomp_policy/mediaextractor-x86.policy
+++ b/services/mediaextractor/seccomp_policy/mediaextractor-x86.policy
@@ -39,6 +39,9 @@
 getgroups32: 1
 nanosleep: 1
 getrandom: 1
+timer_create: 1
+timer_settime: 1
+timer_delete: 1
 
 # for dynamically loading extractors
 getdents64: 1
diff --git a/services/mediaextractor/seccomp_policy/mediaextractor-x86_64.policy b/services/mediaextractor/seccomp_policy/mediaextractor-x86_64.policy
index e6a55d0..4f2646c 100644
--- a/services/mediaextractor/seccomp_policy/mediaextractor-x86_64.policy
+++ b/services/mediaextractor/seccomp_policy/mediaextractor-x86_64.policy
@@ -34,6 +34,9 @@
 getrlimit: 1
 nanosleep: 1
 getrandom: 1
+timer_create: 1
+timer_settime: 1
+timer_delete: 1
 
 # for dynamically loading extractors
 getdents64: 1