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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>
This commit is contained in:
Michael Niedermayer 2012-01-24 18:51:40 +01:00
parent f9de136b17
commit 5cb57a16ed
1 changed files with 2 additions and 1 deletions
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3
libavformat/dv.c
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@ -384,7 +384,8 @@ int avpriv_dv_produce_packet(DVDemuxContext *c, AVPacket *pkt,
c->audio_pkt[i].pts = c->abytes * 30000*8 / c->ast[i]->codec->bit_rate;
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
* channels 0,1 and odd 2,3. */