From 3562684db716d11de0b0dcc52748e9cd90d68132 Mon Sep 17 00:00:00 2001
From: Luca Barbato <lu_zero@gentoo.org>
Date: Tue, 13 Aug 2013 07:28:41 +0200
Subject: [PATCH] ogg: Always alloc the private context in vorbis_header

It is possible to have an initial broken header and then valid packets.

Reported-by: Mateusz "j00ru" Jurczyk and Gynvael Coldwind
CC: libav-stable@libav.org
---
 libavformat/oggparsevorbis.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/libavformat/oggparsevorbis.c b/libavformat/oggparsevorbis.c
index db462fc865..adf8f0360a 100644
--- a/libavformat/oggparsevorbis.c
+++ b/libavformat/oggparsevorbis.c
@@ -212,15 +212,15 @@ vorbis_header (AVFormatContext * s, int idx)
     struct oggvorbis_private *priv;
     int pkt_type = os->buf[os->pstart];
 
-    if (!(pkt_type & 1))
-        return 0;
-
     if (!os->private) {
         os->private = av_mallocz(sizeof(struct oggvorbis_private));
         if (!os->private)
             return 0;
     }
 
+    if (!(pkt_type & 1))
+        return 0;
+
     if (os->psize < 1 || pkt_type > 5)
         return -1;