drivers/rtc/rtc-tps65910.c: fix potential NULL-pointer dereference

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@nvidia.com>
Cc: Alessandro Zummo <a.zummo@towertech.it>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/drivers/rtc/rtc-tps65910.c b/drivers/rtc/rtc-tps65910.c
index 7af0020..2583349 100644 (file)
--- 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;
 }