From eaddc4717bd6e295e9d8c140fb9fb8a4c6b60fb8 Mon Sep 17 00:00:00 2001
From: "R. Brian Anderson" <andersrb@cliftonlabs.com>
Date: Thu, 15 Jun 2006 15:15:20 +0000
Subject: [PATCH] Fix segfault Patch by R. Brian Anderson (andersrb AT
 cliftonlabs DOT com)

Originally committed as revision 5480 to svn://svn.ffmpeg.org/ffmpeg/trunk
---
 libavformat/v4l2.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/libavformat/v4l2.c b/libavformat/v4l2.c
index 7404ef5124..3a2ad1fbac 100644
--- a/libavformat/v4l2.c
+++ b/libavformat/v4l2.c
@@ -457,7 +457,9 @@ static int v4l2_read_header(AVFormatContext *s1, AVFormatParameters *ap)
     if (capabilities & V4L2_CAP_STREAMING) {
         s->io_method = io_mmap;
         res = mmap_init(s);
-        res = mmap_start(s);
+        if (res == 0) {
+            res = mmap_start(s);
+        }
     } else {
         s->io_method = io_read;
         res = read_init(s);