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Fix invalid reads in VC1 decoder

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Patch discussed and taken from https://roundup.ffmpeg.org/issue2584
(cherry picked from commit 2bbec1eda46d907605772a8b6e8263caa4bc4c82)

Change related to CVE-2011-0723
This commit is contained in:
Reimar Döffinger 2011-02-19 11:33:01 +01:00 committed by Reinhard Tartler
parent 2d782b9646
commit cf69619141
1 changed files with 1 additions and 1 deletions
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libavcodec/vc1dec.c
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@ -1365,7 +1365,7 @@ static void vc1_decode_ac_coeff(VC1Context *v, int *last, int *skip, int *value,
if (index != vc1_ac_sizes[codingset] - 1) {
run = vc1_index_decode_table[codingset][index][0];
level = vc1_index_decode_table[codingset][index][1];
lst = index >= vc1_last_decode_table[codingset];
lst = index >= vc1_last_decode_table[codingset] || get_bits_left(gb) < 0;
if(get_bits1(gb))
level = -level;
} else {