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

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Fixes: 1365/clusterfuzz-testcase-minimized-5624158450876416

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit fc2c420b82939a8f30838a6aa08bfd936099d3ce)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2017-05-06 15:17:29 +02:00
parent 903c4b2c3c
commit c78e5a2cb4
1 changed files with 1 additions and 1 deletions
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libavcodec/mimic.c
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@ -262,7 +262,7 @@ static int vlc_decode_block(MimicContext *ctx, int num_coeffs, int qscale)
coeff = vlcdec_lookup[num_bits][value];
if (pos < 3)
coeff <<= 4;
coeff *= 16;
else /* TODO Use >> 10 instead of / 1001 */
coeff = (coeff * qscale) / 1001;