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dv: Fix null pointer dereference due to ach=0

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dv: Fix null pointer dereference due to ach=0

Fixes part2 of CVE-2011-3929

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Reviewed-by: Roman Shaposhnik <roman@shaposhnik.org>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Signed-off-by: Alex Converse <alex.converse@gmail.com>
(cherry picked from commit 5a396bb3a6)
This commit is contained in:
Michael Niedermayer
2012-01-24 17:51:40 +01:00
committed by Alex Converse
parent d7fddc97d4
commit efd30c4d95
1 changed files with 2 additions and 1 deletions
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libavformat/dv.c
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@@ -343,7 +343,8 @@ int avpriv_dv_produce_packet(DVDemuxContext *c, AVPacket *pkt,
c->audio_pkt[i].pts = c->abytes * 30000*8 / c->ast[i]->codec->bit_rate; c->audio_pkt[i].pts = c->abytes * 30000*8 / c->ast[i]->codec->bit_rate;
ppcm[i] = c->audio_buf[i]; ppcm[i] = c->audio_buf[i];
} }
dv_extract_audio(buf, ppcm, c->sys); if (c->ach)
dv_extract_audio(buf, ppcm, c->sys);
/* We work with 720p frames split in half, thus even frames have /* We work with 720p frames split in half, thus even frames have
* channels 0,1 and odd 2,3. */ * channels 0,1 and odd 2,3. */