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avcodec/ffv1dec: Fix off by 1 error in quant_table_count check

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Fixes: invalid_read.nut
Found-by: Paul B Mahol <onemda@gmail.com>

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
(cherry picked from commit 2d221d9e069e6269cb41f3678f2734800171d87b)

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
This commit is contained in:
Michael Niedermayer 2015-09-26 13:20:59 +02:00
parent 97340bdfa3
commit 837113ab5f
1 changed files with 1 additions and 1 deletions
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2
libavcodec/ffv1dec.c
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@ -305,7 +305,7 @@ static int decode_slice_header(FFV1Context *f, FFV1Context *fs)
for (i = 0; i < f->plane_count; i++) {
PlaneContext * const p = &fs->plane[i];
int idx = get_symbol(c, state, 0);
if (idx > (unsigned)f->quant_table_count) {
if (idx >= (unsigned)f->quant_table_count) {
av_log(f->avctx, AV_LOG_ERROR, "quant_table_index out of range\n");
return -1;
}