linux-kernel - [PATCH 1/2] mfd: sm501: Fix potential NULL pointer dereference

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Message-ID: <6376930a04650c2dafcbe306f6d402794c30d5b3.1548175934.git.gustavo@embeddedor.com>
Date:   Tue, 22 Jan 2019 10:56:36 -0600
From:   "Gustavo A. R. Silva" <gustavo@...eddedor.com>
To:     Linus Walleij <linus.walleij@...aro.org>,
        Lee Jones <lee.jones@...aro.org>
Cc:     linux-kernel@...r.kernel.org,
        "Gustavo A. R. Silva" <gustavo@...eddedor.com>
Subject: [PATCH 1/2] mfd: sm501: Fix potential 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 bug was detected with the help of Coccinelle.

Fixes: b2e63555592f ("i2c: gpio: Convert to use descriptors")
Cc: stable@...r.kernel.org
Signed-off-by: Gustavo A. R. Silva <gustavo@...eddedor.com>
---
 drivers/mfd/sm501.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/mfd/sm501.c b/drivers/mfd/sm501.c
index a530972c5a7e..e0173bf4b0dc 100644
--- a/drivers/mfd/sm501.c
+++ b/drivers/mfd/sm501.c
@@ -1145,6 +1145,9 @@ static int sm501_register_gpio_i2c_instance(struct sm501_devdata *sm,
 	lookup = devm_kzalloc(&pdev->dev,
 			      sizeof(*lookup) + 3 * sizeof(struct gpiod_lookup),
 			      GFP_KERNEL);
+	if (!lookup)
+		return -ENOMEM;
+
 	lookup->dev_id = "i2c-gpio";
 	if (iic->pin_sda < 32)
 		lookup->table[0].chip_label = "SM501-LOW";
-- 
2.20.1