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avcodec/alsdec: check predictor order against block length 

Fixes out of array access
Fixes: abd3c041acbcb816be113455d138166b-asan_heap-oob_b11634_3707_cov_1707137151_als_05_2ch48k16b.mp4
Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
This commit is contained in:
Michael Niedermayer 2014-02-16 13:12:39 +01:00
parent ec482e738d
commit 18f94df8af
1 changed files with 5 additions and 1 deletions
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6
libavcodec/alsdec.c
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@ -688,7 +688,11 @@ static int read_var_block_data(ALSDecContext *ctx, ALSBlockData *bd)
} else { } else {
*bd->opt_order = sconf->max_order; *bd->opt_order = sconf->max_order;
} }
if (*bd->opt_order > bd->block_length) {
*bd->opt_order = bd->block_length;
av_log(avctx, AV_LOG_ERROR, "Predictor order too large.\n");
return AVERROR_INVALIDDATA;
}
opt_order = *bd->opt_order; opt_order = *bd->opt_order;
if (opt_order) { if (opt_order) {