[PATCH] gpio: make library immune to error pointers

[Linus Walleij <linus.walleij@xxxxxxxxxx>]

Most functions that take a GPIO descriptor in need to check the
descriptor for IS_ERR(). We do this mostly in the VALIDATE_DESC()
macro except for the gpiod_to_irq() function which needs special
handling.

Cc: stable@xxxxxxxxxxxxxxx
Reported-by: Grygorii Strashko <grygorii.strashko@xxxxxx>
Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
---
 drivers/gpio/gpiolib.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index f39bf05993e7..1a8dbc791892 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -1371,7 +1371,7 @@ done:
  * optional GPIO and calls should just bail out.
  */
 #define VALIDATE_DESC(desc) do { \
-	if (!desc) \
+	if (!desc || IS_ERR(desc)) \
 		return 0; \
 	if (!desc->gdev) { \
 		pr_warn("%s: invalid GPIO\n", __func__); \
@@ -1384,7 +1384,7 @@ done:
 	} } while (0)
 
 #define VALIDATE_DESC_VOID(desc) do { \
-	if (!desc) \
+	if (!desc || IS_ERR(desc)) \
 		return; \
 	if (!desc->gdev) { \
 		pr_warn("%s: invalid GPIO\n", __func__); \
@@ -2061,7 +2061,7 @@ int gpiod_to_irq(const struct gpio_desc *desc)
 	 * requires this function to not return zero on an invalid descriptor
 	 * but rather a negative error number.
 	 */
-	if (!desc || !desc->gdev || !desc->gdev->chip)
+	if (!desc || IS_ERR(desc) || !desc->gdev || !desc->gdev->chip)
 		return -EINVAL;
 
 	chip = desc->gdev->chip;
-- 
2.4.11

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