linux-kernel - [PATCH] driver-core: platform: Catch errors from calls to irq_get_irq

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Message-Id: <1473823964-27402-1-git-send-email-linux@roeck-us.net>
Date:   Tue, 13 Sep 2016 20:32:44 -0700
From:   Guenter Roeck <linux@...ck-us.net>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org,
        Vladimir Zapolskiy <vladimir_zapolskiy@...tor.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Guenter Roeck <linux@...ck-us.net>
Subject: [PATCH] driver-core: platform: Catch errors from calls to irq_get_irq_data

irq_get_irq_data() can return NULL, which results in a nasty crash.
Check its return value before passing it on to irqd_set_trigger_type().

Signed-off-by: Guenter Roeck <linux@...ck-us.net>
---
 drivers/base/platform.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index 6482d47deb50..521c8ff28158 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -108,9 +108,14 @@ int platform_get_irq(struct platform_device *dev, unsigned int num)
 	 * IORESOURCE_BITS correspond 1-to-1 to the IRQF_TRIGGER*
 	 * settings.
 	 */
-	if (r && r->flags & IORESOURCE_BITS)
-		irqd_set_trigger_type(irq_get_irq_data(r->start),
-				      r->flags & IORESOURCE_BITS);
+	if (r && r->flags & IORESOURCE_BITS) {
+		struct irq_data *irqd;
+
+		irqd = irq_get_irq_data(r->start);
+		if (!irqd)
+			return -ENXIO;
+		irqd_set_trigger_type(irqd, r->flags & IORESOURCE_BITS);
+	}
 
 	return r ? r->start : -ENXIO;
 #endif
-- 
2.5.0