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

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Fixes: 2197/clusterfuzz-testcase-minimized-6010716676947968

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 2e44126363)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer
2017-06-11 14:34:54 +02:00
parent 295b24643e
commit d182bb21ad
1 changed files with 1 additions and 1 deletions
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2
libavcodec/snowdec.c
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@@ -583,7 +583,7 @@ static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
for(; yq<slice_h && yq<h; yq++){
IDWTELEM * line = slice_buffer_get_line(&s->sb, yq);
for(x=0; x<w; x++){
line[x] <<= FRAC_BITS;
line[x] *= 1<<FRAC_BITS;
}
}
}