linux-kernel - [PATCH] mtd: nand: mxc_nand: fix a possible NULL dereference

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Date:	Thu, 12 Nov 2015 08:46:55 +0100
From:	LABBE Corentin <clabbe.montjoie@...il.com>
To:	baruch@...s.co.il, clabbe.montjoie@...il.com,
	computersforpeace@...il.com, dwmw2@...radead.org,
	fransklaver@...il.com, k.kozlowski.k@...il.com,
	luis@...ethencourt.com, s.hauer@...gutronix.de,
	u.kleine-koenig@...gutronix.de
Cc:	linux-kernel@...r.kernel.org, linux-mtd@...ts.infradead.org
Subject: [PATCH] mtd: nand: mxc_nand: fix a possible NULL dereference

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

Signed-off-by: LABBE Corentin <clabbe.montjoie@...il.com>
---
 drivers/mtd/nand/mxc_nand.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/mtd/nand/mxc_nand.c b/drivers/mtd/nand/mxc_nand.c
index 136e73a..9e42431 100644
--- a/drivers/mtd/nand/mxc_nand.c
+++ b/drivers/mtd/nand/mxc_nand.c
@@ -1464,8 +1464,7 @@ static int __init mxcnd_probe_dt(struct mxc_nand_host *host)
 {
 	struct device_node *np = host->dev->of_node;
 	struct mxc_nand_platform_data *pdata = &host->pdata;
-	const struct of_device_id *of_id =
-		of_match_device(mxcnd_dt_ids, host->dev);
+	const struct of_device_id *of_id;
 	int buswidth;
 
 	if (!np)
@@ -1482,6 +1481,9 @@ static int __init mxcnd_probe_dt(struct mxc_nand_host *host)
 
 	pdata->width = buswidth / 8;
 
+	of_id = of_match_device(mxcnd_dt_ids, host->dev);
+	if (!of_id)
+		return -ENODEV;
 	host->devtype_data = of_id->data;
 
 	return 0;
-- 
2.4.10

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