diff --git a/services/camera/libcameraservice/device1/CameraHardwareInterface.cpp b/services/camera/libcameraservice/device1/CameraHardwareInterface.cpp
index 991b50f..f539ac1 100644
--- a/services/camera/libcameraservice/device1/CameraHardwareInterface.cpp
+++ b/services/camera/libcameraservice/device1/CameraHardwareInterface.cpp
@@ -97,11 +97,13 @@
         ALOGE("%s: CameraHeapMemory has FD %d (expect >= 0)", __FUNCTION__, memPoolId);
         return 0;
     }
+    std::lock_guard<std::mutex> lock(mHidlMemPoolMapLock);
     mHidlMemPoolMap.insert(std::make_pair(memPoolId, mem));
     return memPoolId;
 }
 
 hardware::Return<void> CameraHardwareInterface::unregisterMemory(uint32_t memId) {
+    std::lock_guard<std::mutex> lock(mHidlMemPoolMapLock);
     if (mHidlMemPoolMap.count(memId) == 0) {
         ALOGE("%s: memory pool ID %d not found", __FUNCTION__, memId);
         return hardware::Void();
@@ -115,6 +117,7 @@
 hardware::Return<void> CameraHardwareInterface::dataCallback(
         DataCallbackMsg msgType, uint32_t data, uint32_t bufferIndex,
         const hardware::camera::device::V1_0::CameraFrameMetadata& metadata) {
+    std::lock_guard<std::mutex> lock(mHidlMemPoolMapLock);
     if (mHidlMemPoolMap.count(data) == 0) {
         ALOGE("%s: memory pool ID %d not found", __FUNCTION__, data);
         return hardware::Void();
@@ -129,6 +132,7 @@
 hardware::Return<void> CameraHardwareInterface::dataCallbackTimestamp(
         DataCallbackMsg msgType, uint32_t data,
         uint32_t bufferIndex, int64_t timestamp) {
+    std::lock_guard<std::mutex> lock(mHidlMemPoolMapLock);
     if (mHidlMemPoolMap.count(data) == 0) {
         ALOGE("%s: memory pool ID %d not found", __FUNCTION__, data);
         return hardware::Void();
@@ -140,6 +144,7 @@
 hardware::Return<void> CameraHardwareInterface::handleCallbackTimestamp(
         DataCallbackMsg msgType, const hidl_handle& frameData, uint32_t data,
         uint32_t bufferIndex, int64_t timestamp) {
+    std::lock_guard<std::mutex> lock(mHidlMemPoolMapLock);
     if (mHidlMemPoolMap.count(data) == 0) {
         ALOGE("%s: memory pool ID %d not found", __FUNCTION__, data);
         return hardware::Void();
@@ -158,6 +163,7 @@
     std::vector<android::HandleTimestampMessage> msgs;
     msgs.reserve(messages.size());
 
+    std::lock_guard<std::mutex> lock(mHidlMemPoolMapLock);
     for (const auto& hidl_msg : messages) {
         if (mHidlMemPoolMap.count(hidl_msg.data) == 0) {
             ALOGE("%s: memory pool ID %d not found", __FUNCTION__, hidl_msg.data);
diff --git a/services/camera/libcameraservice/device1/CameraHardwareInterface.h b/services/camera/libcameraservice/device1/CameraHardwareInterface.h
index 6a1b4fb..e519b04 100644
--- a/services/camera/libcameraservice/device1/CameraHardwareInterface.h
+++ b/services/camera/libcameraservice/device1/CameraHardwareInterface.h
@@ -479,6 +479,7 @@
     uint64_t mNextBufferId = 1;
     static const uint64_t BUFFER_ID_NO_BUFFER = 0;
 
+    std::mutex mHidlMemPoolMapLock; // protecting mHidlMemPoolMap
     std::unordered_map<int, camera_memory_t*> mHidlMemPoolMap;
 };