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

[LABBE Corentin]

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

Signed-off-by: LABBE Corentin <clabbe.montjoie at gmail.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