linux-kernel - [PATCH] rtc-tps65910: fix invalid pointer access on

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Date:	Thu, 29 Nov 2012 02:06:21 +0000
From:	"Kim, Milo" <Milo.Kim@...com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	"a.zummo@...ertech.it" <a.zummo@...ertech.it>,
	"swarren@...dotorg.org" <swarren@...dotorg.org>,
	"vbyravarasu@...dia.com" <vbyravarasu@...dia.com>,
	"sivaramn@...dia.com" <sivaramn@...dia.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH] rtc-tps65910: fix invalid pointer access on _remove()

 The tps65910_rtc data is registered as the platform driver data in _probe().
 Therefore the tps65910_rtc should be used on unregistering the rtc device.
 And device pointer should be retrieved from the platform_device structure.

 This patch fixes the error as below.

 Unable to handle kernel NULL pointer dereference at virtual address 00000008
 Modules linked in: rtc_tps65910(-)
 CPU: 0    Not tainted  (3.7.0-rc7-next-20121128-g6b1f974-dirty #7)
 PC is at tps65910_rtc_alarm_irq_enable+0x20/0x2c [rtc_tps65910]
 LR is at tps65910_rtc_alarm_irq_enable+0x10/0x2c [rtc_tps65910]
 [<bf000044>] (tps65910_rtc_alarm_irq_enable+0x20/0x2c [rtc_tps65910]) from
   [<bf0004d4>] (tps65910_rtc_remove+0x18/0x28 [rtc_)
 [<bf0004d4>] (tps65910_rtc_remove+0x18/0x28 [rtc_tps65910]) from
   [<c034e700>] (platform_drv_remove+0x18/0x1c)
 [<c034e700>] (platform_drv_remove+0x18/0x1c) from
   [<c034ceec>] (__device_release_driver+0x70/0xcc)
 [<c034ceec>] (__device_release_driver+0x70/0xcc) from
   [<c034d608>] (driver_detach+0xb4/0xb8)
 [<c034d608>] (driver_detach+0xb4/0xb8) from
   [<c034cc24>] (bus_remove_driver+0x7c/0xc0)
 [<c034cc24>] (bus_remove_driver+0x7c/0xc0) from
   [<c00a045c>] (sys_delete_module+0x148/0x21c)
 [<c00a045c>] (sys_delete_module+0x148/0x21c) from
   [<c0013c60>] (ret_fast_syscall+0x0/0x3c)

Signed-off-by: Milo(Woogyom) Kim <milo.kim@...com>
---
 drivers/rtc/rtc-tps65910.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/rtc/rtc-tps65910.c b/drivers/rtc/rtc-tps65910.c
index e8d44bc..687006f 100644
--- a/drivers/rtc/rtc-tps65910.c
+++ b/drivers/rtc/rtc-tps65910.c
@@ -288,11 +288,11 @@ static int __devinit tps65910_rtc_probe(struct platform_device *pdev)
 static int __devexit tps65910_rtc_remove(struct platform_device *pdev)
 {
 	/* leave rtc running, but disable irqs */
-	struct rtc_device *rtc = platform_get_drvdata(pdev);
+	struct tps65910_rtc *tps_rtc = platform_get_drvdata(pdev);
 
-	tps65910_rtc_alarm_irq_enable(&rtc->dev, 0);
+	tps65910_rtc_alarm_irq_enable(&pdev->dev, 0);
 
-	rtc_device_unregister(rtc);
+	rtc_device_unregister(tps_rtc->rtc);
 	return 0;
 }
 
-- 
1.7.9.5


Best Regards,
Milo

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