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avcodec/takdec: Fix integer overflow in decode_lpc()

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Fixes: runtime error: signed integer overflow: 16748560 + 2143729712 cannot be represented in type 'int'
Fixes: 3202/clusterfuzz-testcase-minimized-4988291642294272

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 5d31f03a0264cac24434c8108daef4ccba6d28f9)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2017-09-22 20:45:27 +02:00
parent 4bc16930ef
commit ab845587d1
1 changed files with 1 additions and 1 deletions
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libavcodec/takdec.c
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@ -206,7 +206,7 @@ static void decode_lpc(int32_t *coeffs, int mode, int length)
int a1 = *coeffs++; int a1 = *coeffs++;
for (i = 0; i < length - 1 >> 1; i++) { for (i = 0; i < length - 1 >> 1; i++) {
*coeffs += a1; *coeffs += a1;
coeffs[1] += *coeffs; coeffs[1] += (unsigned)*coeffs;
a1 = coeffs[1]; a1 = coeffs[1];
coeffs += 2; coeffs += 2;
} }