From 5cb57a16ede71d913384a0b3036a2c6df5da5e43 Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Tue, 24 Jan 2012 18:51:40 +0100 Subject: [PATCH] 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 Signed-off-by: Michael Niedermayer --- libavformat/dv.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/libavformat/dv.c b/libavformat/dv.c index 062c56787f..86ed1e954e 100644 --- a/libavformat/dv.c +++ b/libavformat/dv.c @@ -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. */