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avcodec/mpegaudiodec_template: Make l3_unscale() work with e=0

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Fixes undefined behavior
Fixes: 830/clusterfuzz-testcase-6253175327686656

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 8ebed703f1)
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2017-03-13 20:45:09 +01:00
parent b34ca8295d
commit 17624e4156
1 changed files with 1 additions and 1 deletions
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2
libavcodec/mpegaudiodec_template.c
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@ -252,7 +252,7 @@ static inline int l3_unscale(int value, int exponent)
#endif
if (e > 31)
return 0;
m = (m + (1 << (e - 1))) >> e;
m = (m + ((1U << e)>>1)) >> e;
return m;
}