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avcodec/dnxhddec: Fix runtime error: left shift of negative value

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Fixes: 2abd25478c62a675f335fac00b467023/asan_static-oob_10aff98_1227_8811480c6ef1e970a7977ceb7e5a9958.mxf

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2015-12-04 13:43:18 +01:00
parent 9d44e23618
commit 2ff61c3c1a
1 changed files with 1 additions and 1 deletions
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2
libavcodec/dnxhddec.c
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@ -361,7 +361,7 @@ static av_always_inline int dnxhd_decode_dct_block(const DNXHDContext *ctx,
LAST_SKIP_BITS(bs, &row->gb, len);
sign = ~level >> 31;
level = (NEG_USR32(sign ^ level, len) ^ sign) - sign;
row->last_dc[component] += level << dc_shift;
row->last_dc[component] += level * (1 << dc_shift);
}
block[0] = row->last_dc[component];