DO NOT MERGE Fix divide by zero am: 2e211d38a3
am: 52e86acf03

Change-Id: I866eb4f2537b3297090158f160f448861b47a527
diff --git a/media/libstagefright/MPEG4Extractor.cpp b/media/libstagefright/MPEG4Extractor.cpp
index 9e7f298..a5342f4 100755
--- a/media/libstagefright/MPEG4Extractor.cpp
+++ b/media/libstagefright/MPEG4Extractor.cpp
@@ -472,7 +472,8 @@
             } else {
                 uint32_t sampleIndex;
                 uint32_t sampleTime;
-                if (track->sampleTable->findThumbnailSample(&sampleIndex) == OK
+                if (track->timescale != 0 &&
+                        track->sampleTable->findThumbnailSample(&sampleIndex) == OK
                         && track->sampleTable->getMetaDataForSample(
                             sampleIndex, NULL /* offset */, NULL /* size */,
                             &sampleTime) == OK) {
@@ -886,6 +887,10 @@
         case FOURCC('s', 'c', 'h', 'i'):
         case FOURCC('e', 'd', 't', 's'):
         {
+            if (chunk_type == FOURCC('m', 'o', 'o', 'v') && depth != 0) {
+                ALOGE("moov: depth %d", depth);
+                return ERROR_MALFORMED;
+            }
             if (chunk_type == FOURCC('m', 'o', 'o', 'f') && !mMoofFound) {
                 // store the offset of the first segment
                 mMoofFound = true;
@@ -914,6 +919,10 @@
 
             bool isTrack = false;
             if (chunk_type == FOURCC('t', 'r', 'a', 'k')) {
+                if (depth != 1) {
+                    ALOGE("trak: depth %d", depth);
+                    return ERROR_MALFORMED;
+                }
                 isTrack = true;
 
                 Track *track = new Track;
@@ -937,6 +946,10 @@
             while (*offset < stop_offset) {
                 status_t err = parseChunk(offset, depth + 1);
                 if (err != OK) {
+                    if (isTrack) {
+                        mLastTrack->skipTrack = true;
+                        break;
+                    }
                     return err;
                 }
             }
@@ -1282,10 +1295,6 @@
 
         case FOURCC('s', 't', 's', 'd'):
         {
-            if (chunk_data_size < 8) {
-                return ERROR_MALFORMED;
-            }
-
             uint8_t buffer[8];
             if (chunk_data_size < (off64_t)sizeof(buffer)) {
                 return ERROR_MALFORMED;
@@ -1865,6 +1874,10 @@
         {
             *offset += chunk_size;
 
+            if (depth != 1) {
+                ALOGE("mvhd: depth %d", depth);
+                return ERROR_MALFORMED;
+            }
             if (chunk_data_size < 32) {
                 return ERROR_MALFORMED;
             }