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avcodec/mpeg4videodec: more unsigned in amv computation 

Fixes: signed integer overflow: -2147483648 + -1048576 cannot be represented in type 'int'
Fixes: 59365/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_MPEG4_fuzzer-642654923954585

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 0adaa90d89)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2023-06-01 23:35:10 +02:00
parent 7e27518e98
commit c4a7dbdbee
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1 changed files with 1 additions and 1 deletions
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libavcodec/mpeg4videodec.c
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@ -616,7 +616,7 @@ static inline int get_amv(Mpeg4DecContext *ctx, int n)
for (y = 0; y < 16; y++) { for (y = 0; y < 16; y++) {
int v; int v;
v = mb_v + dy * y; v = mb_v + (unsigned)dy * y;
// FIXME optimize // FIXME optimize
for (x = 0; x < 16; x++) { for (x = 0; x < 16; x++) {
sum += v >> shift; sum += v >> shift;