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avcodec/ralf: fix undefined shift in extend_code()

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Fixes: left shift of negative value -3
Fixes: 16147/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_RALF_fuzzer-5658392722407424

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 4778407ab3b545c40def7e95a8f9dd4ae92a4e8e)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2019-08-17 19:25:01 +02:00
parent 1da3f1084e
commit ac0ffb67f5
1 changed files with 1 additions and 1 deletions
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2
libavcodec/ralf.c
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@ -220,7 +220,7 @@ static inline int extend_code(GetBitContext *gb, int val, int range, int bits)
val -= range; val -= range;
} }
if (bits) if (bits)
val = (val << bits) | get_bits(gb, bits); val = ((unsigned)val << bits) | get_bits(gb, bits);
return val; return val;
} }