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avcodec/vc1: Check bfraction_lut_index
Fixes: out of array read
Fixes: asan_static-oob_1b40507_2849_SA10143.vc1
Fixes: asan_static-oob_1b40a15_2849_cov_1182297305_SA10143.vc1
Fixes: asan_static-oob_1b40f15_2849_cov_2159513432_SA10143.vc1
Fixes: asan_static-oob_1b40f15_2849_cov_3230311510_SA10143.vc1
Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
(cherry picked from commit dcf5bfbdb6
)
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
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ab1c7113f9
@ -628,7 +628,13 @@ static void rotate_luts(VC1Context *v)
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}
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static int read_bfraction(VC1Context *v, GetBitContext* gb) {
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v->bfraction_lut_index = get_vlc2(gb, ff_vc1_bfraction_vlc.table, VC1_BFRACTION_VLC_BITS, 1);
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int bfraction_lut_index = get_vlc2(gb, ff_vc1_bfraction_vlc.table, VC1_BFRACTION_VLC_BITS, 1);
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if (bfraction_lut_index == 21 || bfraction_lut_index < 0) {
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av_log(v->s.avctx, AV_LOG_ERROR, "bfraction invalid\n");
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return AVERROR_INVALIDDATA;
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}
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v->bfraction_lut_index = bfraction_lut_index;
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v->bfraction = ff_vc1_bfraction_lut[v->bfraction_lut_index];
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return 0;
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}
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