linux-kernel - [PATCH] video: fbdev: matrox: matroxfb_base.c: Fix for possible null pointer dereference

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Message-Id: <1404337551-6499-1-git-send-email-rickard_strandqvist@spectrumdigital.se>
Date:	Wed,  2 Jul 2014 23:45:51 +0200
From:	Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>
To:	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Tomi Valkeinen <tomi.valkeinen@...com>
Cc:	Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>,
	Jingoo Han <jg1.han@...sung.com>,
	Alexandru Juncu <alexj@...edu.org>,
	Mikulas Patocka <mpatocka@...hat.com>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	Joe Perches <joe@...ches.com>, linux-fbdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] video: fbdev: matrox: matroxfb_base.c:  Fix for possible null pointer dereference

Fix a possible null pointer dereference, there is otherwise a risk of a possible null pointer dereference

This was found using a static code analysis program called cppcheck

Signed-off-by: Rickard Strandqvist <rickard_strandqvist@...ctrumdigital.se>
---
 drivers/video/fbdev/matrox/matroxfb_base.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/video/fbdev/matrox/matroxfb_base.c b/drivers/video/fbdev/matrox/matroxfb_base.c
index 7116c53..85ef84b 100644
--- a/drivers/video/fbdev/matrox/matroxfb_base.c
+++ b/drivers/video/fbdev/matrox/matroxfb_base.c
@@ -1971,9 +1971,9 @@ static void matroxfb_register_device(struct matrox_fb_info* minfo) {
 	int i = 0;
 	list_add(&minfo->next_fb, &matroxfb_list);
 	for (drv = matroxfb_driver_l(matroxfb_driver_list.next);
-	     drv != matroxfb_driver_l(&matroxfb_driver_list);
+	     drv && drv != matroxfb_driver_l(&matroxfb_driver_list);
 	     drv = matroxfb_driver_l(drv->node.next)) {
-		if (drv && drv->probe) {
+		if (drv->probe) {
 			void *p = drv->probe(minfo);
 			if (p) {
 				minfo->drivers_data[i] = p;
-- 
1.7.10.4

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