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| author | Jean-Michel Trivi <jmtrivi@google.com> | 2017-10-30 15:20:44 -0700 |
|---|---|---|
| committer | Jean-Michel Trivi <jmtrivi@google.com> | 2017-10-30 22:46:18 +0000 |
| commit | 070e7b81c0d673cfafba5a41914259503d459adf (patch) | |
| tree | 23d80c3b7ee8db1ebe5603fd7be50033edbdd2f0 | |
| parent | 1de50b286fdadc07f94e0d8fae69a564796ab12a (diff) | |
| download | fdk-aac-070e7b81c0d673cfafba5a41914259503d459adf.tar.gz fdk-aac-070e7b81c0d673cfafba5a41914259503d459adf.tar.bz2 fdk-aac-070e7b81c0d673cfafba5a41914259503d459adf.zip | |
DO NOT MERGE Prevent out of bound memory access in GetInvInt
In GetInvInt(int) function, malicious content can access memory
outside of the invCount array. Always bound access to valid
indices.
Test: see bug for malicious content, decoded with "stagefright -s -a"
Bug: 65025048
Change-Id: Iff889601828f95b82d9291075f3909922ef533ef
| -rw-r--r-- | libFDK/include/fixpoint_math.h | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/libFDK/include/fixpoint_math.h b/libFDK/include/fixpoint_math.h index df141d3..26c001f 100644 --- a/libFDK/include/fixpoint_math.h +++ b/libFDK/include/fixpoint_math.h @@ -450,15 +450,19 @@ inline FIXP_DBL fAddSaturate(const FIXP_DBL a, const FIXP_DBL b) /** * \brief Calculate the value of 1/i where i is a integer value. It supports - * input values from 1 upto 50. + * input values from 0 upto 49. * \param intValue Integer input value. * \param FIXP_DBL representation of 1/intValue */ inline FIXP_DBL GetInvInt(int intValue) { - FDK_ASSERT((intValue > 0) && (intValue < 50)); - FDK_ASSERT(intValue<50); - return invCount[intValue]; + FDK_ASSERT((intValue >= 0) && (intValue < 50)); + if (intValue < 0) + return invCount[0]; + else if (intValue > 49) + return invCount[49]; + else + return invCount[intValue]; } |