From 8b05e13df3b25e186adaf19cf84f5fa93d829214 Mon Sep 17 00:00:00 2001
From: Anton Khirnov <anton@khirnov.net>
Date: Sun, 6 May 2012 07:14:01 +0200
Subject: [PATCH] buffersrc: fix invalid read in uninit if the fifo hasn't been
 allocated

---
 libavfilter/buffersrc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libavfilter/buffersrc.c b/libavfilter/buffersrc.c
index 1ace368413..c7284c1ff8 100644
--- a/libavfilter/buffersrc.c
+++ b/libavfilter/buffersrc.c
@@ -137,7 +137,7 @@ static av_cold int init(AVFilterContext *ctx, const char *args, void *opaque)
 static av_cold void uninit(AVFilterContext *ctx)
 {
     BufferSourceContext *s = ctx->priv;
-    while (av_fifo_size(s->fifo)) {
+    while (s->fifo && av_fifo_size(s->fifo)) {
         AVFilterBufferRef *buf;
         av_fifo_generic_read(s->fifo, &buf, sizeof(buf), NULL);
         avfilter_unref_buffer(buf);
-- 
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