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USB: chipidea: fix use after free bug

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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>
Cc: stable <stable@vger.kernel.org> # 3.6
Acked-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Lothar Waßmann 2012-11-22 10:11:25 +01:00 committed by Greg Kroah-Hartman
parent 9db72fe6c9
commit 98c3553442
1 changed files with 2 additions and 1 deletions
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3
drivers/usb/chipidea/core.c
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@ -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);