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avcodec/wavpack: Check shift

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Fixes: runtime error: shift exponent 255 is too large for 32-bit type 'unsigned int'
Fixes: 894/clusterfuzz-testcase-4841537823309824

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 2017-03-20 02:05:23 +01:00
parent b15818642b
commit 423375d4f0
1 changed files with 6 additions and 0 deletions
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6
libavcodec/wavpack.c
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@ -861,6 +861,12 @@ static int wavpack_decode_block(AVCodecContext *avctx, int block_no,
s->and = 1;
s->shift = val[3];
}
if (s->shift > 31) {
av_log(avctx, AV_LOG_ERROR,
"Invalid INT32INFO, shift = %d (> 31)\n", s->shift);
s->and = s->or = s->shift = 0;
continue;
}
/* original WavPack decoder forces 32-bit lossy sound to be treated
* as 24-bit one in order to have proper clipping */
if (s->hybrid && bpp == 4 && s->post_shift < 8 && s->shift > 8) {