linux-kernel - [PATCH] iio: accel: mma9551_core: prevent using uninitialized variable

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Message-Id: <20181210142532.15315-1-martink@posteo.de>
Date:   Mon, 10 Dec 2018 15:25:32 +0100
From:   Martin Kepplinger <martink@...teo.de>
To:     jic23@...nel.org, knaack.h@....de, lars@...afoo.de,
        pmeerw@...erw.net
Cc:     linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
        Martin Kepplinger <martink@...teo.de>
Subject: [PATCH] iio: accel: mma9551_core: prevent using uninitialized variable

mma9551_gpio_config()'s switch statement sets the uninitialized pol_mask
variable but doesn't have default settings. Said function can therefore
be called in a way to use the uninitialized variable (at least in case
enum mma9551_gpio_pin is extended with unhandled values).

While things should be fine now, this initializes pol_mask just to prevent
failure.

Signed-off-by: Martin Kepplinger <martink@...teo.de>
---
 drivers/iio/accel/mma9551_core.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/accel/mma9551_core.c b/drivers/iio/accel/mma9551_core.c
index c34c5ce8123b..2fc79b14888b 100644
--- a/drivers/iio/accel/mma9551_core.c
+++ b/drivers/iio/accel/mma9551_core.c
@@ -539,7 +539,8 @@ EXPORT_SYMBOL(mma9551_update_config_bits);
 int mma9551_gpio_config(struct i2c_client *client, enum mma9551_gpio_pin pin,
 			u8 app_id, u8 bitnum, int polarity)
 {
-	u8 reg, pol_mask, pol_val;
+	u8 reg, pol_val;
+	u8 pol_mask = 0;
 	int ret;
 
 	if (pin > mma9551_gpio_max) {
-- 
2.11.0