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

From: Grygorii Strashko
Date: Thu Nov 12 2015 - 13:42:08 EST


On 11/12/2015 08:26 PM, Dmitry Torokhov wrote:
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@xxxxxxxxx>
---

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)

<= 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;



--
regards,
-grygorii
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