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gpio: potential null dereference

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Smatch found a potential null dereference in gpio_setup_irq().  The
"pdesc" variable is allocated with idr_find() that can return NULL.  If
gpio_setup_irq() is called with 0 as gpio_flags and "pdesc" is null, it
would OOPs here.

Signed-off-by: Dan Carpenter <error27@gmail.com>
Cc: David Brownell <david-b@pacbell.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
This commit is contained in:
Dan Carpenter 2010-04-27 14:12:03 -07:00 committed by Grant Likely
parent 01bf0b6457
commit 3913fd5ed4
1 changed files with 2 additions and 1 deletions
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1
drivers/gpio/gpiolib.c
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@ -416,6 +416,7 @@ static int gpio_setup_irq(struct gpio_desc *desc, struct device *dev,
return 0;
free_sd:
if (pdesc)
sysfs_put(pdesc->value_sd);
free_id:
idr_remove(&pdesc_idr, id);