From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Greg Kroah-Hartman , alan@lxorguk.ukuu.org.uk, =?UTF-8?q?Lothar=20Wa=C3=9Fmann?= , Alexander Shishkin Subject: [ 030/123] USB: chipidea: fix use after free bug Date: Wed, 9 Jan 2013 12:34:29 -0800 Message-Id: <20130109201502.398469757@linuxfoundation.org> In-Reply-To: <20130109201458.392601412@linuxfoundation.org> References: <20130109201458.392601412@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: 3.7-stable review patch. If anyone has any objections, please let me know. ------------------ From: Lothar Waßmann commit 98c35534420d3147553bd3071a5fc63cd56de5b1 upstream. 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 Acked-by: Alexander Shishkin Signed-off-by: Greg Kroah-Hartman --- drivers/usb/chipidea/core.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- 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);