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avcodec/fastaudio: Fix invalid shift exponent

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Fixes: shift exponent 32 is too large for 32-bit type 'unsigned int'
Fixes: 25434/clusterfuzz-testcase-minimized-ffmpeg_AV_CODEC_ID_FASTAUDIO_fuzzer-6252363168612352

Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2020-09-08 23:03:19 +02:00
parent 3336ca4644
commit 2749e20d04
1 changed files with 1 additions and 1 deletions
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libavcodec/fastaudio.c
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@ -89,7 +89,7 @@ static int read_bits(int bits, int *ppos, unsigned *src)
pos = *ppos;
pos += bits;
r = src[(pos - 1) / 32] >> (32 - pos % 32);
r = src[(pos - 1) / 32] >> ((-pos) & 31);
*ppos = pos;
return r & ((1 << bits) - 1);