From cd4765efdd816ac14075fc7d5adf489502e75e1e Mon Sep 17 00:00:00 2001
From: Mauro Carvalho Chehab <mchehab@infradead.org>
Date: Tue, 25 Sep 2007 11:53:24 -0300
Subject: [PATCH] V4L/DVB (6265): Prevent for calling mmap_free without an
 allocated buffer

Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
http://thread.gmane.org/gmane.comp.video.video4linux/34978/focus=34981
Reviewed-by: Ricardo Cerqueira <v4l@cerqueira.org>
---
 drivers/media/video/videobuf-core.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/media/video/videobuf-core.c b/drivers/media/video/videobuf-core.c
index 256501384af7..eb3b98400c1b 100644
--- a/drivers/media/video/videobuf-core.c
+++ b/drivers/media/video/videobuf-core.c
@@ -880,6 +880,9 @@ int videobuf_mmap_free(struct videobuf_queue *q)
 	int i;
 	int rc;
 
+	if (!q)
+		return 0;
+
 	MAGIC_CHECK(q->int_ops->magic,MAGIC_QTYPE_OPS);
 
 	rc  = CALL(q,mmap_free,q);
-- 
2.20.1