Patch "gpiolib: don't dereference a desc before validation" has been added to the 4.15-stable tree

This is a note to let you know that I've just added the patch titled

gpiolib: don't dereference a desc before validation

to the 4.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
gpiolib-don-t-dereference-a-desc-before-validation.patch
and it can be found in the queue-4.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Vladimir Zapolskiy <[email protected]>
Date: Thu, 21 Dec 2017 18:37:24 +0200
Subject: gpiolib: don't dereference a desc before validation

From: Vladimir Zapolskiy <[email protected]>

[ Upstream commit 30322bcf82d74cad0d6e1cf9ba7fa7fa48c7a026 ]

The fix restores a proper validation of an input gpio desc, which might be needed to deal with optional GPIOs correctly.

---
 drivers/gpio/gpiolib.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

@@ -2468,7 +2468,7 @@ EXPORT_SYMBOL_GPL(gpiod_direction_output
  */
 int gpiod_direction_output(struct gpio_desc *desc, int value)
 {
-	struct gpio_chip *gc = desc->gdev->chip;
+	struct gpio_chip *gc;
 	int ret;
 
 	VALIDATE_DESC(desc);

@@ -2485,6 +2485,7 @@ int gpiod_direction_output(struct gpio_d
 		return -EIO;
 	}
 
+	gc = desc->gdev->chip;
 	if (test_bit(FLAG_OPEN_DRAIN, &desc->flags)) {
 		/* First see if we can enable open drain in hardware */
 		ret = gpio_set_drive_single_ended(gc, gpio_chip_hwgpio(desc),

Patches currently in stable-queue which might be from [email protected] are

queue-4.15/gpiolib-don-t-dereference-a-desc-before-validation.patch