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

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Message-ID: <20151112182657.GA19785@dtor-ws>
Date:	Thu, 12 Nov 2015 10:26:57 -0800
From:	Dmitry Torokhov <dmitry.torokhov@...il.com>
To:	"Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Tony Lindgren <tony@...mide.com>,
	Grygorii Strashko <grygorii.strashko@...com>,
	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] PM / wakeirq: check that wake IRQ is valid before accepting
 it

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@...il.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
--
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