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avcodec/diracdec: Fix integer overflow in divide3()

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Fixes: runtime error: signed integer overflow: -1073746548 * 21845 cannot be represented in type 'int'
Fixes: 2729/clusterfuzz-testcase-minimized-5902915464069120

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 c0220c768c)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2017-07-27 23:49:27 +02:00
parent 406d9fdd13
commit 95bbbbd14e
1 changed files with 1 additions and 1 deletions
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libavcodec/diracdec.c
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@ -285,7 +285,7 @@ static const int qoffset_inter_tab[MAX_QUANT+1] = {
/* magic number division by 3 from schroedinger */
static inline int divide3(int x)
{
return ((x+1)*21845 + 10922) >> 16;
return (int)((x+1U)*21845 + 10922) >> 16;
}
static DiracFrame *remove_frame(DiracFrame *framelist[], int picnum)