Commit 6b1c7104 authored by Michael Niedermayer's avatar Michael Niedermayer

avcodec/diracdec: Fix integer overflow in divide3()

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/ffmpegSigned-off-by: 's avatarMichael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit c0220c76)
Signed-off-by: 's avatarMichael Niedermayer <michael@niedermayer.cc>
parent 6274709c
......@@ -231,7 +231,7 @@ enum dirac_subband {
/* 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)
......
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