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avcodec/dxtory: Fix negative shift in dxtory_decode_v1_410() 

Fixes: left shift of negative value -256
Fixes: 25460/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_DXTORY_fuzzer-5073252341514240

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 2020-09-25 17:15:29 +02:00
parent 497debb171
commit c3d1c7f903
1 changed files with 4 additions and 4 deletions
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8
libavcodec/dxtory.c
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@ -177,10 +177,10 @@ static int dxtory_decode_v1_410(AVCodecContext *avctx, AVFrame *pic,
V[huvborder] = src[1] + 0x80;
src += 2;
}
Y1 += pic->linesize[0] << 2;
Y2 += pic->linesize[0] << 2;
Y3 += pic->linesize[0] << 2;
Y4 += pic->linesize[0] << 2;
Y1 += pic->linesize[0] * 4;
Y2 += pic->linesize[0] * 4;
Y3 += pic->linesize[0] * 4;
Y4 += pic->linesize[0] * 4;
U += pic->linesize[1];
V += pic->linesize[2];
}