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Code Issues Releases Activity

wmalosslessdec: Fix reading too many bits in decode_channel_residues()

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Fixes a part of CVE-2012-2795

CC:libav-stable@libav.org

Based on a patch by Michael Niedermayer <michaelni@gmx.at>

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
This commit is contained in:
Anton Khirnov 2012-09-29 19:16:32 +02:00
parent f48fbf2eb5
commit 6a99310fce
1 changed files with 1 additions and 1 deletions
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2
libavcodec/wmalosslessdec.c
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@ -520,7 +520,7 @@ static int decode_channel_residues(WmallDecodeCtx *s, int ch, int tile_size)
residue = quo;
else {
rem_bits = av_ceil_log2(ave_mean);
rem = rem_bits ? get_bits(&s->gb, rem_bits) : 0;
rem = rem_bits ? get_bits_long(&s->gb, rem_bits) : 0;
residue = (quo << rem_bits) + rem;
}