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avcodec/h264_direct: Fix runtime error: signed integer overflow: 2147483647 - -14133 cannot be represented in type 'int' 

Fixes: 755/clusterfuzz-testcase-5369072516595712

See: [FFmpeg-devel] [PATCH 1/2] avcodec/h264_direct: Fix runtime error: signed integer overflow: 2147483647 - -14133 cannot be represented in type 'int'

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2017-03-10 15:24:52 +01:00
parent fbfbd97be2
commit a557ae8d52
1 changed files with 6 additions and 1 deletions
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7
libavcodec/h264_direct.c
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@ -39,7 +39,12 @@ static int get_scale_factor(H264SliceContext *sl,
int poc, int poc1, int i)
{
int poc0 = sl->ref_list[0][i].poc;
int td = av_clip_int8(poc1 - poc0);
int64_t pocdiff = poc1 - (int64_t)poc0;
int td = av_clip_int8(pocdiff);
if (pocdiff != (int)pocdiff)
avpriv_request_sample(sl->h264->avctx, "pocdiff overflow\n");
if (td == 0 || sl->ref_list[0][i].parent->long_ref) {
return 256;
} else {