From 555000c7d5c1e13043a948ebc48d2939b0ba6536 Mon Sep 17 00:00:00 2001
From: Anton Khirnov <anton@khirnov.net>
Date: Sun, 10 Mar 2013 23:28:31 +0100
Subject: [PATCH] h264: check that DPB is allocated before accessing it in
 flush_dpb()

---
 libavcodec/h264.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/libavcodec/h264.c b/libavcodec/h264.c
index de5ca403ae..e0d5433a4e 100644
--- a/libavcodec/h264.c
+++ b/libavcodec/h264.c
@@ -2623,8 +2623,9 @@ static void flush_dpb(AVCodecContext *avctx)
 
     flush_change(h);
 
-    for (i = 0; i < MAX_PICTURE_COUNT; i++)
-        unref_picture(h, &h->DPB[i]);
+    if (h->DPB)
+        for (i = 0; i < MAX_PICTURE_COUNT; i++)
+            unref_picture(h, &h->DPB[i]);
     h->cur_pic_ptr = NULL;
     unref_picture(h, &h->cur_pic);