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avcodec/h264_mvpred: Fix runtime error: left shift of negative value -1 

Fixes: 734/clusterfuzz-testcase-4821293192970240

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 2017-03-08 21:53:15 +01:00
parent 800d02abe0
commit 222c9f031d
1 changed files with 1 additions and 1 deletions
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2
libavcodec/h264_mvpred.h
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@ -68,7 +68,7 @@ static av_always_inline int fetch_diagonal_mv(const H264Context *h, H264SliceCon
}
if (MB_FIELD(sl) && !IS_INTERLACED(sl->left_type[0])) {
// left shift will turn LIST_NOT_USED into PART_NOT_AVAILABLE, but that's OK.
SET_DIAG_MV(/ 2, << 1, sl->left_mb_xy[i >= 36], ((i >> 2)) & 3);
SET_DIAG_MV(/ 2, *2, sl->left_mb_xy[i >= 36], ((i >> 2)) & 3);
}
}
#undef SET_DIAG_MV