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>
---
ChangeLog v1->v2:
- Complain when descriptors contain error values so the offending
code can be fixed.
---
drivers/gpio/gpiolib.c | 14 +++++++++++---
1 file changed, 11 insertions(+), 3 deletions(-)
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index f39bf05993e7..570771ed19e6 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -1373,8 +1373,12 @@ done:
#define VALIDATE_DESC(desc) do { \
if (!desc) \
return 0; \
+ if (IS_ERR(desc)) { \
+ pr_warn("%s: invalid GPIO (errorpointer)\n", __func__); \
+ return PTR_ERR(desc); \
+ } \
if (!desc->gdev) { \
- pr_warn("%s: invalid GPIO\n", __func__); \
+ pr_warn("%s: invalid GPIO (no device)\n", __func__); \
return -EINVAL; \
} \
if ( !desc->gdev->chip ) { \
@@ -1386,8 +1390,12 @@ done:
#define VALIDATE_DESC_VOID(desc) do { \
if (!desc) \
return; \
+ if (IS_ERR(desc)) { \
+ pr_warn("%s: invalid GPIO (errorpointer)\n", __func__); \
+ return; \
+ } \
if (!desc->gdev) { \
- pr_warn("%s: invalid GPIO\n", __func__); \
+ pr_warn("%s: invalid GPIO (no device)\n", __func__); \
return; \
} \
if (!desc->gdev->chip) { \
@@ -2061,7 +2069,7 @@ 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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