linux-kernel - [patch] video: fbdev: pxafb: potential NULL dereference on error

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Date:	Fri, 15 Jul 2016 14:07:32 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Robert Jarzmik <robert.jarzmik@...e.fr>
Cc:	Tomi Valkeinen <tomi.valkeinen@...com>,
	"Rafael J. Wysocki" <rafael.j.wysocki@...el.com>,
	Viresh Kumar <viresh.kumar@...aro.org>,
	"Luis R. Rodriguez" <mcgrof@...e.com>, linux-fbdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [patch] video: fbdev: pxafb: potential NULL dereference on error

If we "goto out;" then it calls display_timings_release(timings);
Since "timings" is NULL, that's going to oops.  Just return directly.

Fixes: 420a488278e8 ('video: fbdev: pxafb: initial devicetree conversion')
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>

diff --git a/drivers/video/fbdev/pxafb.c b/drivers/video/fbdev/pxafb.c
index 2c0487f..ed41fdb 100644
--- a/drivers/video/fbdev/pxafb.c
+++ b/drivers/video/fbdev/pxafb.c
@@ -2125,7 +2125,7 @@ static int of_get_pxafb_display(struct device *dev, struct device_node *disp,
 
 	timings = of_get_display_timings(disp);
 	if (!timings)
-		goto out;
+		return -EINVAL;
 
 	ret = -ENOMEM;
 	info->modes = kmalloc_array(timings->num_timings,