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Fix stack corruption happening in aacDecoder_drcExtractAndMap() 

In the aacDecoder_drcExtractAndMap() function, self->numThreads
  can be used after having exceeded its intended max value,
  MAX_DRC_THREADS, causing memory to be cleared after the
  threadBs[MAX_DRC_THREADS] array.
The crash is prevented by never using self->numThreads with
  a value equal to or greater than MAX_DRC_THREADS.
A proper fix will be required as there seems to be an issue as
  to which entry in the threadBs array is meant to be initialized
  and used.

Bug 26751339

Change-Id: I655cc40c35d4206ab72e83b2bdb751be2fe52b5a
This commit is contained in:
Jean-Michel Trivi 2016-03-21 14:12:19 -07:00
parent fa3eba1644
commit a06d1c2b9a
1 changed files with 9 additions and 1 deletions
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10
libAACdec/src/aacdec_drc.cpp
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@ -2,7 +2,7 @@
/* -----------------------------------------------------------------------------------------------------------
Software License for The Fraunhofer FDK AAC Codec Library for Android
© Copyright 1995 - 2013 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
© Copyright 1995 - 2013 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
All rights reserved.
1. INTRODUCTION
@ -680,6 +680,10 @@ static int aacDecoder_drcExtractAndMap (
}
self->numPayloads = 0;
if (self->numThreads >= MAX_DRC_THREADS) {
self->numThreads = MAX_DRC_THREADS - 1;
}
if (self->dvbAncDataAvailable)
{ /* Append a DVB heavy compression payload thread if available. */
int bitsParsed;
@ -706,6 +710,10 @@ static int aacDecoder_drcExtractAndMap (
/* coupling channels not supported */
if (self->numThreads >= MAX_DRC_THREADS) {
self->numThreads = MAX_DRC_THREADS - 1;
}
/* check for valid threads */
for (thread = 0; thread < self->numThreads; thread++) {
CDrcPayload *pThreadBs = &threadBs[thread];