From d2f47191538837e796e2b10c1ff7e1ee35f6e0ab Mon Sep 17 00:00:00 2001
From: Wonsik Kim <wonsik@google.com>
Date: Sun, 20 Mar 2016 10:44:44 +0900
Subject: codecs: check OMX buffer size before use in (h263|h264)dec

Bug: 27833616
Change-Id: I0fd599b3da431425d89236ffdd9df423c11947c0
---
 .../codecs/m4v_h263/dec/SoftMPEG4.cpp              | 10 ++++++++-
 .../libstagefright/codecs/on2/h264dec/SoftAVC.cpp  | 26 +++++++++++++++++-----
 media/libstagefright/codecs/on2/h264dec/SoftAVC.h  |  2 +-
 3 files changed, 31 insertions(+), 7 deletions(-)

(limited to 'media/libstagefright')

diff --git a/media/libstagefright/codecs/m4v_h263/dec/SoftMPEG4.cpp b/media/libstagefright/codecs/m4v_h263/dec/SoftMPEG4.cpp
index 0c1a149..bb59ae4 100644
--- a/media/libstagefright/codecs/m4v_h263/dec/SoftMPEG4.cpp
+++ b/media/libstagefright/codecs/m4v_h263/dec/SoftMPEG4.cpp
@@ -229,6 +229,14 @@ void SoftMPEG4::onQueueFilled(OMX_U32 /* portIndex */) {
         int32_t bufferSize = inHeader->nFilledLen;
         int32_t tmp = bufferSize;
 
+        OMX_U32 frameSize = (mWidth * mHeight * 3) / 2;
+        if (outHeader->nAllocLen < frameSize) {
+            android_errorWriteLog(0x534e4554, "27833616");
+            ALOGE("Insufficient output buffer size");
+            notify(OMX_EventError, OMX_ErrorUndefined, 0, NULL);
+            mSignalledError = true;
+            return;
+        }
         // The PV decoder is lying to us, sometimes it'll claim to only have
         // consumed a subset of the buffer when it clearly consumed all of it.
         // ignore whatever it says...
@@ -272,7 +280,7 @@ void SoftMPEG4::onQueueFilled(OMX_U32 /* portIndex */) {
         ++mInputBufferCount;
 
         outHeader->nOffset = 0;
-        outHeader->nFilledLen = (mWidth * mHeight * 3) / 2;
+        outHeader->nFilledLen = frameSize;
 
         List<BufferInfo *>::iterator it = outQueue.begin();
         while ((*it)->mHeader != outHeader) {
diff --git a/media/libstagefright/codecs/on2/h264dec/SoftAVC.cpp b/media/libstagefright/codecs/on2/h264dec/SoftAVC.cpp
index 6b8b395..2f61d12 100644
--- a/media/libstagefright/codecs/on2/h264dec/SoftAVC.cpp
+++ b/media/libstagefright/codecs/on2/h264dec/SoftAVC.cpp
@@ -202,7 +202,12 @@ void SoftAVC::onQueueFilled(OMX_U32 /* portIndex */) {
         }
 
         if (mFirstPicture && !outQueue.empty()) {
-            drainOneOutputBuffer(mFirstPictureId, mFirstPicture);
+            if (!drainOneOutputBuffer(mFirstPictureId, mFirstPicture)) {
+                ALOGE("Drain failed");
+                notify(OMX_EventError, OMX_ErrorUndefined, 0, NULL);
+                mSignalledError = true;
+                return;
+            }
             delete[] mFirstPicture;
             mFirstPicture = NULL;
             mFirstPictureId = -1;
@@ -242,15 +247,20 @@ void SoftAVC::saveFirstOutputBuffer(int32_t picId, uint8_t *data) {
     memcpy(mFirstPicture, data, pictureSize);
 }
 
-void SoftAVC::drainOneOutputBuffer(int32_t picId, uint8_t* data) {
+bool SoftAVC::drainOneOutputBuffer(int32_t picId, uint8_t* data) {
     List<BufferInfo *> &outQueue = getPortQueue(kOutputPortIndex);
     BufferInfo *outInfo = *outQueue.begin();
-    outQueue.erase(outQueue.begin());
     OMX_BUFFERHEADERTYPE *outHeader = outInfo->mHeader;
+    OMX_U32 frameSize = mWidth * mHeight * 3 / 2;
+    if (outHeader->nAllocLen - outHeader->nOffset < frameSize) {
+        android_errorWriteLog(0x534e4554, "27833616");
+        return false;
+    }
+    outQueue.erase(outQueue.begin());
     OMX_BUFFERHEADERTYPE *header = mPicToHeaderMap.valueFor(picId);
     outHeader->nTimeStamp = header->nTimeStamp;
     outHeader->nFlags = header->nFlags;
-    outHeader->nFilledLen = mWidth * mHeight * 3 / 2;
+    outHeader->nFilledLen = frameSize;
 
     uint8_t *dst = outHeader->pBuffer + outHeader->nOffset;
     const uint8_t *srcY = data;
@@ -265,6 +275,7 @@ void SoftAVC::drainOneOutputBuffer(int32_t picId, uint8_t* data) {
     delete header;
     outInfo->mOwnedByUs = false;
     notifyFillBufferDone(outHeader);
+    return true;
 }
 
 void SoftAVC::drainAllOutputBuffers(bool eos) {
@@ -277,7 +288,12 @@ void SoftAVC::drainAllOutputBuffers(bool eos) {
                     mHandle, &decodedPicture, eos /* flush */)) {
             int32_t picId = decodedPicture.picId;
             uint8_t *data = (uint8_t *) decodedPicture.pOutputPicture;
-            drainOneOutputBuffer(picId, data);
+            if (!drainOneOutputBuffer(picId, data)) {
+                ALOGE("Drain failed");
+                notify(OMX_EventError, OMX_ErrorUndefined, 0, NULL);
+                mSignalledError = true;
+                return;
+            }
         }
     }
 
diff --git a/media/libstagefright/codecs/on2/h264dec/SoftAVC.h b/media/libstagefright/codecs/on2/h264dec/SoftAVC.h
index 069107d..b8c1807 100644
--- a/media/libstagefright/codecs/on2/h264dec/SoftAVC.h
+++ b/media/libstagefright/codecs/on2/h264dec/SoftAVC.h
@@ -71,7 +71,7 @@ private:
 
     status_t initDecoder();
     void drainAllOutputBuffers(bool eos);
-    void drainOneOutputBuffer(int32_t picId, uint8_t *data);
+    bool drainOneOutputBuffer(int32_t picId, uint8_t *data);
     void saveFirstOutputBuffer(int32_t pidId, uint8_t *data);
     CropSettingsMode handleCropParams(const H264SwDecInfo& decInfo);
 
-- 
cgit v1.1