From 69fb605ad5e0f1384ca4d06d38ce0f1b6c8c286d Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michaelni@gmx.at>
Date: Thu, 24 Jan 2013 02:51:12 +0100
Subject: [PATCH] mpc8: check stream count before accessing stream 1.
Fixes null pointer dereference
Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
---
libavformat/mpc8.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/libavformat/mpc8.c b/libavformat/mpc8.c
index 011c7c8e645..73f805711d2 100644
--- a/libavformat/mpc8.c
+++ b/libavformat/mpc8.c
@@ -139,6 +139,11 @@ static void mpc8_parse_seektable(AVFormatContext *s, int64_t off)
int i, t, seekd;
GetBitContext gb;
+ if (s->nb_streams<=0) {
+ av_log(s, AV_LOG_ERROR, "cannot parse stream table before stream header\n");
+ return;
+ }
+
avio_seek(s->pb, off, SEEK_SET);
mpc8_get_chunk_header(s->pb, &tag, &size);
if(tag != TAG_SEEKTABLE){
--
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