linux-kernel - [PATCH 2/2] fbdev: ssd1307fb: fix a possible NULL dereference

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Message-Id: <1471339638-25134-2-git-send-email-clabbe.montjoie@gmail.com>
Date:	Tue, 16 Aug 2016 11:27:18 +0200
From:	LABBE Corentin <clabbe.montjoie@...il.com>
To:	plagnioj@...osoft.com, tomi.valkeinen@...com
Cc:	linux-fbdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	LABBE Corentin <clabbe.montjoie@...il.com>
Subject: [PATCH 2/2] fbdev: ssd1307fb: fix a possible NULL dereference

of_match_device could return NULL, and so cause a NULL pointer
dereference later.

For fixing this problem, we use of_device_get_match_data(), this will
simplify the code a little by using a standard function for
getting the match data.

Signed-off-by: LABBE Corentin <clabbe.montjoie@...il.com>
---
 drivers/video/fbdev/ssd1307fb.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/video/fbdev/ssd1307fb.c b/drivers/video/fbdev/ssd1307fb.c
index b6c9ecf..4265035 100644
--- a/drivers/video/fbdev/ssd1307fb.c
+++ b/drivers/video/fbdev/ssd1307fb.c
@@ -559,8 +559,7 @@ static int ssd1307fb_probe(struct i2c_client *client,
 	par->info = info;
 	par->client = client;
 
-	par->device_info = of_match_device(ssd1307fb_of_match,
-					   &client->dev)->data;
+	par->device_info = of_device_get_match_data(&client->dev);
 
 	par->reset = of_get_named_gpio(client->dev.of_node,
 					 "reset-gpios", 0);
-- 
2.7.3