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usb: gadget: f_hid: fix f_hidg lifetime vs cdev
[ Upstream commit 89ff3df ] The embedded struct cdev does not have its lifetime correctly tied to the enclosing struct f_hidg, so there is a use-after-free if /dev/hidgN is held open while the gadget is deleted. This can readily be replicated with libusbgx's example programs (for conciseness - operating directly via configfs is equivalent): gadget-hid exec 3<> /dev/hidg0 gadget-vid-pid-remove exec 3<&- Pull the existing device up in to struct f_hidg and make use of the cdev_device_{add,del}() helpers. This changes the lifetime of the device object to match struct f_hidg, but note that it is still added and deleted at the same time. Fixes: 71adf11 ("USB: gadget: add HID gadget driver") Tested-by: Lee Jones <lee@kernel.org> Reviewed-by: Andrzej Pietrasiewicz <andrzej.p@collabora.com> Reviewed-by: Lee Jones <lee@kernel.org> Signed-off-by: John Keeping <john@metanate.com> Link: https://lore.kernel.org/r/20221122123523.3068034-2-john@metanate.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Sasha Levin <sashal@kernel.org>
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