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avcodec/ilbcdec: Fix integer overflow in construct_vector()

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webrtc contains explicit code to ignore the undefined behavior (RTC_NO_SANITIZE / OverflowingAddS32S32ToS32())

Probably fixes: Integer overflow (unreproducable here)
Probably fixes: 12215/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_ILBC_fuzzer-5767142427852800

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit c95d0fb23917c35886f3b62daa05af20d2700a1e)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-01-15 00:02:25 +01:00
parent bcfd82b0be
commit 62f5325ca3
1 changed files with 1 additions and 1 deletions
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2
libavcodec/ilbcdec.c
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@ -745,7 +745,7 @@ static void construct_vector (
for (j = 0; j < veclen; j++) {
a32 = SPL_MUL_16_16(*gainPtr++, cbvec0[j]);
a32 += SPL_MUL_16_16(*gainPtr++, cbvec1[j]);
a32 += SPL_MUL_16_16(*gainPtr, cbvec2[j]);
a32 += (unsigned)SPL_MUL_16_16(*gainPtr, cbvec2[j]);
gainPtr -= 2;
decvector[j] = (a32 + 8192) >> 14;
}