linux-kernel - [PATCH 3.16 042/136] media: omap_vout: Fix a possible null pointer dereference in omap_vout

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Message-ID: <lsq.1518323471.830968840@decadent.org.uk>
Date:   Sun, 11 Feb 2018 04:31:11 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org,
        "Markus Elfring" <elfring@...rs.sourceforge.net>,
        "Mauro Carvalho Chehab" <mchehab@...pensource.com>,
        "Hans Verkuil" <hans.verkuil@...co.com>
Subject: [PATCH 3.16 042/136] media: omap_vout: Fix a possible null
 pointer dereference in omap_vout_open()

3.16.54-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Markus Elfring <elfring@...rs.sourceforge.net>

commit bfba2b3e21b9426c0f9aca00f3cad8631b2da170 upstream.

Move a debug message so that a null pointer access can not happen
for the variable "vout" in this function.

Fixes: 5c7ab6348e7b3fcca2b8ee548306c774472971e2 ("V4L/DVB: V4L2: Add support for OMAP2/3 V4L2 display driver on top of DSS2")

Signed-off-by: Markus Elfring <elfring@...rs.sourceforge.net>
Signed-off-by: Hans Verkuil <hans.verkuil@...co.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@...pensource.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/media/platform/omap/omap_vout.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/media/platform/omap/omap_vout.c
+++ b/drivers/media/platform/omap/omap_vout.c
@@ -1017,11 +1017,12 @@ static int omap_vout_open(struct file *f
 	struct omap_vout_device *vout = NULL;
 
 	vout = video_drvdata(file);
-	v4l2_dbg(1, debug, &vout->vid_dev->v4l2_dev, "Entering %s\n", __func__);
 
 	if (vout == NULL)
 		return -ENODEV;
 
+	v4l2_dbg(1, debug, &vout->vid_dev->v4l2_dev, "Entering %s\n", __func__);
+
 	/* for now, we only support single open */
 	if (vout->opened)
 		return -EBUSY;