[PATCH] PM / wakeirq: check that wake IRQ is valid before accepting it

[Dmitry Torokhov <dmitry.torokhov@gmail.com>]

Check that IRQ number passed to dev_pm_set_wake_irq and
dev_pm_set_dedicated_wake_irq is valid (not negative) before accepting it.

Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
---

My recent change to i2c core introduced a code path that led to calling
dev_pm_set_wake_irq(&client->dev, -ENOENT), which succeeded but
obviously did the wrong thing. Checking the IRQ and bailing out early
would have helped noticing this issue earlier.

 drivers/base/power/wakeirq.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/base/power/wakeirq.c b/drivers/base/power/wakeirq.c
index eb6e674..0d77cd6 100644
--- a/drivers/base/power/wakeirq.c
+++ b/drivers/base/power/wakeirq.c
@@ -68,6 +68,9 @@ int dev_pm_set_wake_irq(struct device *dev, int irq)
 	struct wake_irq *wirq;
 	int err;
 
+	if (irq < 0)
+		return -EINVAL;
+
 	wirq = kzalloc(sizeof(*wirq), GFP_KERNEL);
 	if (!wirq)
 		return -ENOMEM;
@@ -167,6 +170,9 @@ int dev_pm_set_dedicated_wake_irq(struct device *dev, int irq)
 	struct wake_irq *wirq;
 	int err;
 
+	if (irq < 0)
+		return -EINVAL;
+
 	wirq = kzalloc(sizeof(*wirq), GFP_KERNEL);
 	if (!wirq)
 		return -ENOMEM;
-- 
2.6.0.rc2.230.g3dd15c0


-- 
Dmitry