rtc: Fix possible null pointer dereference in rtc-mpc5121.c
Mark Loard pointed out:
"For example, this beauty from rtc-mpc5121.c in the same update:
...
rtc->rtc = rtc_device_register("mpc5200-rtc", &op->dev,
&mpc5200_rtc_ops, THIS_MODULE);
...
rtc->rtc->uie_unsupported = 1; // <<<< Ooops NULL pointer >>>>
if (IS_ERR(rtc->rtc)) { // <<<< this needs to be earlier >>>>
err = PTR_ERR(rtc->rtc);
goto out_free_irq;
}
..."
This patch moves setting the uie_unsupported flag to after we validate
the rtc->rtc pointer to resolve this.
Reported by: Mark Lord <kernel@teksavvy.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>
Link: http://lkml.kernel.org/r/1335300215-21427-1-git-send-email-john.stultz@linaro.org
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
diff --git a/drivers/rtc/rtc-mpc5121.c b/drivers/rtc/rtc-mpc5121.c
index 42f5f82..029e421 100644
--- a/drivers/rtc/rtc-mpc5121.c
+++ b/drivers/rtc/rtc-mpc5121.c
@@ -360,12 +360,11 @@
&mpc5200_rtc_ops, THIS_MODULE);
}
- rtc->rtc->uie_unsupported = 1;
-
if (IS_ERR(rtc->rtc)) {
err = PTR_ERR(rtc->rtc);
goto out_free_irq;
}
+ rtc->rtc->uie_unsupported = 1;
return 0;