A-Team_Digital_Solutions/android_kernel_motorola_sm6375
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serial: mctrl_gpio: Check for NULL pointer

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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 <[email protected]>
Reviewed-by: Yegor Yefremov <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Adam Ford 2019-10-06 11:33:11 -05:00 • committed by Greg Kroah-Hartman
commit 37e3ab00e4
1 changed files with 3 additions and 0 deletions
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3
drivers/tty/serial/serial_mctrl_gpio.c
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@ -66,6 +66,9 @@ 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);