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avcodec/dxtory: Fix undefined shift with negative linesize 

Fixes: left shift of negative value -128
Fixes: 30746/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_DXTORY_fuzzer-5906271469436928

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Reviewed-by: Paul B Mahol <onemda@gmail.com>
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2021-02-22 17:51:56 +01:00
parent 3072438429
commit f01d522cf3
1 changed files with 2 additions and 2 deletions
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4
libavcodec/dxtory.c
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@ -264,8 +264,8 @@ static int dxtory_decode_v1_420(AVCodecContext *avctx, AVFrame *pic,
V[huvborder] = src[3] + 0x80;
src += 4;
}
Y1 += pic->linesize[0] << 1;
Y2 += pic->linesize[0] << 1;
Y1 += pic->linesize[0] * 2;
Y2 += pic->linesize[0] * 2;
U += pic->linesize[1];
V += pic->linesize[2];
}