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avcodec/wavpack: Check post_shift

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Fixes: runtime error: shift exponent 34 is too large for 32-bit type 'int'

Fixes: 653/clusterfuzz-testcase-5773837415219200

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2017-02-23 15:19:29 +01:00
parent dbc7f02a72
commit 5eb04570f6
1 changed files with 3 additions and 0 deletions
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3
libavcodec/wavpack.c
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@ -681,6 +681,9 @@ static int wavpack_decode_block(AVCodecContext *avctx, int block_no,
s->hybrid = s->frame_flags & WV_HYBRID_MODE;
s->hybrid_bitrate = s->frame_flags & WV_HYBRID_BITRATE;
s->post_shift = bpp * 8 - orig_bpp + ((s->frame_flags >> 13) & 0x1f);
if (s->post_shift < 0 || s->post_shift > 31) {
return AVERROR_INVALIDDATA;
}
s->hybrid_maxclip = ((1LL << (orig_bpp - 1)) - 1);
s->hybrid_minclip = ((-1UL << (orig_bpp - 1)));
s->CRC = bytestream2_get_le32(&gb);