From: "Gustavo A. R. Silva" <gustavo@embeddedor.com>
To: Tudor Ambarus <tudor.ambarus@microchip.com>,
Boris Brezillon <boris.brezillon@bootlin.com>,
Miquel Raynal <miquel.raynal@bootlin.com>,
Richard Weinberger <richard@nod.at>,
David Woodhouse <dwmw2@infradead.org>,
Brian Norris <computersforpeace@gmail.com>,
Marek Vasut <marek.vasut@gmail.com>,
Nicolas Ferre <nicolas.ferre@microchip.com>,
Alexandre Belloni <alexandre.belloni@bootlin.com>,
Ludovic Desroches <ludovic.desroches@microchip.com>
Cc: linux-mtd@lists.infradead.org,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org,
"Gustavo A. R. Silva" <gustavo@embeddedor.com>
Subject: [PATCH] mtd: rawnand: atmel: Fix potential NULL pointer dereference
Date: Tue, 18 Sep 2018 08:33:17 -0500 [thread overview]
Message-ID: <20180918133317.GA17358@embeddedor.com> (raw)
There is a potential execution path in which function
of_find_compatible_node() returns NULL. In such a case,
we end up having a NULL pointer dereference when accessing
pointer *nfc_np* in function of_clk_get().
So, we better don't take any chances and fix this by null
checking pointer *nfc_np* before calling of_clk_get().
Addresses-Coverity-ID: 1473052 ("Dereference null return value")
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
---
drivers/mtd/nand/raw/atmel/nand-controller.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/mtd/nand/raw/atmel/nand-controller.c b/drivers/mtd/nand/raw/atmel/nand-controller.c
index a38633a..ffa0c6b6 100644
--- a/drivers/mtd/nand/raw/atmel/nand-controller.c
+++ b/drivers/mtd/nand/raw/atmel/nand-controller.c
@@ -2035,6 +2035,11 @@ atmel_hsmc_nand_controller_legacy_init(struct atmel_hsmc_nand_controller *nc)
nfc_np = of_find_compatible_node(dev->of_node, NULL,
"atmel,sama5d3-nfc");
+ if (!nfc_np) {
+ dev_err(dev, "Could not find device node for sama5d3-nfc\n");
+ return -ENODEV;
+ }
+
nc->clk = of_clk_get(nfc_np, 0);
if (IS_ERR(nc->clk)) {
ret = PTR_ERR(nc->clk);
--
2.7.4
next reply other threads:[~2018-09-18 13:33 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-18 13:33 Gustavo A. R. Silva [this message]
2018-09-18 13:40 ` [PATCH] mtd: rawnand: atmel: Fix potential NULL pointer dereference Boris Brezillon
2018-09-18 13:44 ` Gustavo A. R. Silva
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