linux-kernel - [PATCH] rtc: tps65910: Fix potential NULL-pointer dereference

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Message-Id: <1407238538-13997-1-git-send-email-thierry.reding@gmail.com>
Date:	Tue,  5 Aug 2014 13:35:38 +0200
From:	Thierry Reding <thierry.reding@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Alessandro Zummo <a.zummo@...ertech.it>,
	rtc-linux@...glegroups.com, linux-kernel@...r.kernel.org
Subject: [PATCH] rtc: tps65910: Fix potential NULL-pointer dereference

From: Thierry Reding <treding@...dia.com>

The interrupt handler gets the driver data associated with the RTC
device and doesn't check it for validity. This can cause a NULL pointer
being dereferenced when and interrupt fires before the driver data was
properly set up.

Fix this by setting the driver data earlier (before the interrupt is
requested).

Signed-off-by: Thierry Reding <treding@...dia.com>
---
 drivers/rtc/rtc-tps65910.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/rtc/rtc-tps65910.c b/drivers/rtc/rtc-tps65910.c
index 7af00208d637..2583349fbde5 100644
--- a/drivers/rtc/rtc-tps65910.c
+++ b/drivers/rtc/rtc-tps65910.c
@@ -258,6 +258,8 @@ static int tps65910_rtc_probe(struct platform_device *pdev)
 	if (ret < 0)
 		return ret;
 
+	platform_set_drvdata(pdev, tps_rtc);
+
 	irq  = platform_get_irq(pdev, 0);
 	if (irq <= 0) {
 		dev_warn(&pdev->dev, "Wake up is not possible as irq = %d\n",
@@ -283,8 +285,6 @@ static int tps65910_rtc_probe(struct platform_device *pdev)
 		return ret;
 	}
 
-	platform_set_drvdata(pdev, tps_rtc);
-
 	return 0;
 }
 
-- 
2.0.4

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