From 5aedee4facb2295cfdeaf322bc67fd15323862d9 Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michaelni@gmx.at>
Date: Sun, 11 Nov 2012 20:57:45 +0100
Subject: [PATCH] gxf: avoid null ptr deref without streams.

Found-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
---
 libavformat/gxf.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/libavformat/gxf.c b/libavformat/gxf.c
index 0286439c44..4088088eef 100644
--- a/libavformat/gxf.c
+++ b/libavformat/gxf.c
@@ -270,15 +270,16 @@ static void gxf_track_tags(AVIOContext *pb, int *len, struct gxf_stream_info *si
  */
 static void gxf_read_index(AVFormatContext *s, int pkt_len) {
     AVIOContext *pb = s->pb;
-    AVStream *st = s->streams[0];
+    AVStream *st;
     uint32_t fields_per_map = avio_rl32(pb);
     uint32_t map_cnt = avio_rl32(pb);
     int i;
     pkt_len -= 8;
-    if (s->flags & AVFMT_FLAG_IGNIDX) {
+    if ((s->flags & AVFMT_FLAG_IGNIDX) || !s->streams) {
         avio_skip(pb, pkt_len);
         return;
     }
+    st = s->streams[0];
     if (map_cnt > 1000) {
         av_log(s, AV_LOG_ERROR, "too many index entries %u (%x)\n", map_cnt, map_cnt);
         map_cnt = 1000;