From c84ba07db4abd123b2ad93784e312a24d9341553 Mon Sep 17 00:00:00 2001
From: Michael Niedermayer <michael@niedermayer.cc>
Date: Sun, 24 Apr 2016 12:07:37 +0200
Subject: [PATCH] avformat/mux: Check that deinit is set before calling it

Fixes null pointer dereference

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
---
 libavformat/mux.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/libavformat/mux.c b/libavformat/mux.c
index 6239fd192d..91388e3790 100644
--- a/libavformat/mux.c
+++ b/libavformat/mux.c
@@ -424,7 +424,8 @@ FF_ENABLE_DEPRECATION_WARNINGS
     }
 
     if (s->oformat->init && (ret = s->oformat->init(s)) < 0) {
-        s->oformat->deinit(s);
+        if (s->oformat->deinit)
+            s->oformat->deinit(s);
         goto fail;
     }