linux-kernel - [PATCH 4.8 125/138] video: fbdev: pxafb: potential NULL dereference on error

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Message-Id: <20161109102850.700777453@linuxfoundation.org>
Date:   Wed,  9 Nov 2016 11:46:48 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Dan Carpenter <dan.carpenter@...cle.com>,
        Robert Jarzmik <robert.jarzmik@...e.fr>,
        Tomi Valkeinen <tomi.valkeinen@...com>
Subject: [PATCH 4.8 125/138] video: fbdev: pxafb: potential NULL dereference on error

4.8-stable review patch.  If anyone has any objections, please let me know.

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

From: Dan Carpenter <dan.carpenter@...cle.com>

commit e0299908d606a99e7ffb467bc3c11dfe54133af3 upstream.

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>
Acked-by: Robert Jarzmik <robert.jarzmik@...e.fr>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@...com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/video/fbdev/pxafb.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/video/fbdev/pxafb.c
+++ b/drivers/video/fbdev/pxafb.c
@@ -2125,7 +2125,7 @@ static int of_get_pxafb_display(struct d
 
 	timings = of_get_display_timings(disp);
 	if (!timings)
-		goto out;
+		return -EINVAL;
 
 	ret = -ENOMEM;
 	info->modes = kmalloc_array(timings->num_timings,