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

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Message-Id: <1447314579-31374-1-git-send-email-clabbe.montjoie@gmail.com>
Date:	Thu, 12 Nov 2015 08:49:39 +0100
From:	LABBE Corentin <clabbe.montjoie@...il.com>
To:	computersforpeace@...il.com, dwmw2@...radead.org, josh.wu@...el.com
Cc:	LABBE Corentin <clabbe.montjoie@...il.com>,
	linux-kernel@...r.kernel.org, linux-mtd@...ts.infradead.org
Subject: [PATCH] mtd: nand: atmel_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/atmel_nand.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/mtd/nand/atmel_nand.c b/drivers/mtd/nand/atmel_nand.c
index 475c938..f3cf68b 100644
--- a/drivers/mtd/nand/atmel_nand.c
+++ b/drivers/mtd/nand/atmel_nand.c
@@ -1495,9 +1495,12 @@ static int atmel_of_init_port(struct atmel_nand_host *host,
 	int ecc_mode;
 	struct atmel_nand_data *board = &host->board;
 	enum of_gpio_flags flags = 0;
+	const struct of_device_id *of_id;
 
-	host->caps = (struct atmel_nand_caps *)
-		of_match_device(atmel_nand_dt_ids, host->dev)->data;
+	of_id = of_match_device(atmel_nand_dt_ids, host->dev);
+	if (!of_id)
+		return -ENODEV;
+	host->caps = of_id->data;
 
 	if (of_property_read_u32(np, "atmel,nand-addr-offset", &val) == 0) {
 		if (val >= 32) {
-- 
2.4.10

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