From: Adam Ford <aford...@gmail.com> [ Upstream commit 37e3ab00e4734acc15d96b2926aab55c894f4d9c ]
When using mctrl_gpio_to_gpiod, it dereferences gpios into a single requested GPIO. This dereferencing can break if gpios is NULL, so this patch adds a NULL check before dereferencing it. If gpios is NULL, this function will also return NULL. Signed-off-by: Adam Ford <aford...@gmail.com> Reviewed-by: Yegor Yefremov <yegorsli...@googlemail.com> Link: https://lore.kernel.org/r/20191006163314.23191-1-aford...@gmail.com Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org> Signed-off-by: Sasha Levin <sas...@kernel.org> --- drivers/tty/serial/serial_mctrl_gpio.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/tty/serial/serial_mctrl_gpio.c b/drivers/tty/serial/serial_mctrl_gpio.c index 07f318603e740..af0412a784d27 100644 --- a/drivers/tty/serial/serial_mctrl_gpio.c +++ b/drivers/tty/serial/serial_mctrl_gpio.c @@ -60,6 +60,9 @@ EXPORT_SYMBOL_GPL(mctrl_gpio_set); struct gpio_desc *mctrl_gpio_to_gpiod(struct mctrl_gpios *gpios, enum mctrl_gpio_idx gidx) { + if (gpios == NULL) + return NULL; + return gpios->gpio[gidx]; } EXPORT_SYMBOL_GPL(mctrl_gpio_to_gpiod); -- 2.20.1
