linux-kernel - [PATCH 1/2] ARM: integrator: impd1: fix NULL pointer dereference

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Message-ID: <84a16ed64a29984b11c34b4f31cdef0758ffbfb2.1546621488.git.gustavo@embeddedor.com>
Date:   Fri, 4 Jan 2019 11:17:53 -0600
From:   "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To:     Russell King <linux@...linux.org.uk>,
        Linus Walleij <linus.walleij@...aro.org>
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Subject: [PATCH 1/2] ARM: integrator: impd1: fix NULL pointer dereference

There is a potential NULL pointer dereference in case devm_kzalloc()
fails and returns NULL.

Fix this by adding a NULL check on lookup.

This issue was detected with the help of Coccinelle.

Fixes: 684284b64aae ("ARM: integrator: add MMCI device to IM-PD1")
Cc: stable@...r.kernel.org
Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>
---
 arch/arm/mach-integrator/impd1.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/arm/mach-integrator/impd1.c b/arch/arm/mach-integrator/impd1.c
index a109f6482413..eb0149561be2 100644
--- a/arch/arm/mach-integrator/impd1.c
+++ b/arch/arm/mach-integrator/impd1.c
@@ -392,6 +392,9 @@ static int __ref impd1_probe(struct lm_device *dev)
 			lookup = devm_kzalloc(&dev->dev,
 					      sizeof(*lookup) + 3 * sizeof(struct gpiod_lookup),
 					      GFP_KERNEL);
+			if (!lookup)
+				return -ENOMEM;
+
 			chipname = devm_kstrdup(&dev->dev, devname, GFP_KERNEL);
 			mmciname = kasprintf(GFP_KERNEL, "lm%x:00700", dev->id);
 			lookup->dev_id = mmciname;
-- 
2.20.1