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mfd: sm501: Fix potential NULL pointer dereference

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commit ae7b8eda27b33b1f688dfdebe4d46f690a8f9162 upstream.

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: b2e6355559 ("i2c: gpio: Convert to use descriptors")
Cc: stable@vger.kernel.org
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Gustavo A. R. Silva 2019-01-22 10:56:36 -06:00 • committed by Greg Kroah-Hartman
commit ce02d82c4e
1 changed files with 3 additions and 0 deletions
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3
drivers/mfd/sm501.c
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@ -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";