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avcodec/mpegaudiodec_template: Check for negative e

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Fixes: undefined shift
Fixes: 631/clusterfuzz-testcase-6725491035734016

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/targets/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2017-03-08 21:25:13 +01:00
parent 5cd3cd5b68
commit 58dd25f8ad
1 changed files with 1 additions and 1 deletions
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2
libavcodec/mpegaudiodec_template.c
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@ -251,7 +251,7 @@ static inline int l3_unscale(int value, int exponent)
if(e < 1)
av_log(NULL, AV_LOG_WARNING, "l3_unscale: e is %d\n", e);
#endif
if (e > 31)
if (e > (SUINT)31)
return 0;
m = (m + (1 << (e - 1))) >> e;