From 6a89b41d9780325ba6d89a37f2aeb925aa68e6a3 Mon Sep 17 00:00:00 2001 From: Michael Niedermayer Date: Tue, 24 Jan 2012 22:20:26 +0100 Subject: nsvdec: Fix use of uninitialized streams. Fixes CVE-2011-3940 (Out of bounds read resulting in out of bounds write) Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind Signed-off-by: Michael Niedermayer (cherry picked from commit 5c011706bc752d34bc6ada31d7df2ca0c9af7c6b) Signed-off-by: Alex Converse --- libavformat/nsvdec.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) (limited to 'libavformat/nsvdec.c') diff --git a/libavformat/nsvdec.c b/libavformat/nsvdec.c index b5bc87aa8c..aa114db097 100644 --- a/libavformat/nsvdec.c +++ b/libavformat/nsvdec.c @@ -605,12 +605,12 @@ null_chunk_retry: } /* map back streams to v,a */ - if (s->streams[0]) + if (s->nb_streams > 0) st[s->streams[0]->id] = s->streams[0]; - if (s->streams[1]) + if (s->nb_streams > 1) st[s->streams[1]->id] = s->streams[1]; - if (vsize/* && st[NSV_ST_VIDEO]*/) { + if (vsize && st[NSV_ST_VIDEO]) { nst = st[NSV_ST_VIDEO]->priv_data; pkt = &nsv->ahead[NSV_ST_VIDEO]; av_get_packet(pb, pkt, vsize); @@ -623,7 +623,7 @@ null_chunk_retry: if(st[NSV_ST_VIDEO]) ((NSVStream*)st[NSV_ST_VIDEO]->priv_data)->frame_offset++; - if (asize/*st[NSV_ST_AUDIO]*/) { + if (asize && st[NSV_ST_AUDIO]) { nst = st[NSV_ST_AUDIO]->priv_data; pkt = &nsv->ahead[NSV_ST_AUDIO]; /* read raw audio specific header on the first audio chunk... */ -- cgit v1.2.3