linux-kernel - [PATCH] RTC/watchdog: M41T80: Fix a potential use of unitialized data

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Date:	Fri, 9 May 2008 23:12:05 +0100 (BST)
From:	"Maciej W. Rozycki" <macro@...ux-mips.org>
To:	Alessandro Zummo <a.zummo@...ertech.it>,
	Alexander Bigga <ab@...able.de>,
	Andrew Morton <akpm@...ux-foundation.org>
cc:	Wim Van Sebroeck <wim@...ana.be>, rtc-linux@...glegroups.com,
	linux-kernel@...r.kernel.org
Subject: [PATCH] RTC/watchdog: M41T80: Fix a potential use of unitialized
 data

 Watchdog handlers within the driver make use of "save_client" -- make
sure it has been initalized before the handlers are registered.

Signed-off-by: Maciej W. Rozycki <macro@...ux-mips.org>
---
 It should be obvious.  Please apply.

  Maciej

patch-2.6.26-rc1-20080505-m41t80-save_client-14
diff -up --recursive --new-file linux-2.6.26-rc1-20080505.macro/drivers/rtc/rtc-m41t80.c linux-2.6.26-rc1-20080505/drivers/rtc/rtc-m41t80.c
--- linux-2.6.26-rc1-20080505.macro/drivers/rtc/rtc-m41t80.c	2008-05-05 02:55:40.000000000 +0000
+++ linux-2.6.26-rc1-20080505/drivers/rtc/rtc-m41t80.c	2008-05-09 22:00:13.000000000 +0000
@@ -803,6 +803,7 @@ static int m41t80_probe(struct i2c_clien
 
 #ifdef CONFIG_RTC_DRV_M41T80_WDT
 	if (clientdata->features & M41T80_FEATURE_HT) {
+		save_client = client;
 		rc = misc_register(&wdt_dev);
 		if (rc)
 			goto exit;
@@ -811,7 +812,6 @@ static int m41t80_probe(struct i2c_clien
 			misc_deregister(&wdt_dev);
 			goto exit;
 		}
-		save_client = client;
 	}
 #endif
 	return 0;
--
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