linux-kernel - [BUGFIX PATCH] USB: chipidea: fix use after free bug

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Message-Id: <1353575485-23941-1-git-send-email-LW@KARO-electronics.de>
Date:	Thu, 22 Nov 2012 10:11:25 +0100
From:	Lothar Waßmann <LW@...O-electronics.de>
To:	Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
	Lothar Waßmann <LW@...O-electronics.de>
Subject: [BUGFIX PATCH] USB: chipidea: fix use after free bug

The pointer to a platform_device struct must not be dereferenced after
the device has been unregistered.

This bug produces a crash when unloading the ci13xxx kernel module
compiled with CONFIG_PAGE_POISONING enabled.

Signed-off-by: Lothar Waßmann <LW@...O-electronics.de>
---
 drivers/usb/chipidea/core.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/drivers/usb/chipidea/core.c b/drivers/usb/chipidea/core.c
index f69d029..b726c49 100644
--- a/drivers/usb/chipidea/core.c
+++ b/drivers/usb/chipidea/core.c
@@ -385,8 +385,9 @@ EXPORT_SYMBOL_GPL(ci13xxx_add_device);
 
 void ci13xxx_remove_device(struct platform_device *pdev)
 {
+	int id = pdev->id;
 	platform_device_unregister(pdev);
-	ida_simple_remove(&ci_ida, pdev->id);
+	ida_simple_remove(&ci_ida, id);
 }
 EXPORT_SYMBOL_GPL(ci13xxx_remove_device);
 
-- 
1.7.2.5

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