| From | Greg Kroah-Hartman <> | Subject | [ 030/123] USB: chipidea: fix use after free bug | Date | Wed, 9 Jan 2013 12:34:29 -0800 |
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3.7-stable review patch. If anyone has any objections, please let me know.
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From: Lothar Waßmann <LW@KARO-electronics.de>
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 <LW@KARO-electronics.de> Acked-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- 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);
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