[PATCH] mfd: sm501: Fix potential NULL pointer dereference

[Aditya Pakki]

lookup variable on failure of allocating memory via devm_kzalloc
can cause a NULL pointer dereference. This patch avoids such a scenario.

Signed-off-by: Aditya Pakki <pakki...@umn.edu>
---
 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";
-- 
2.17.1