| From | Greg Kroah-Hartman <> | Subject | [PATCH 5.4 047/177] usb: roles: fix a potential use after free | Date | Mon, 16 Dec 2019 18:48:23 +0100 |
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From: Wen Yang <wenyang@linux.alibaba.com>
commit 1848a543191ae32e558bb0a5974ae7c38ebd86fc upstream.
Free the sw structure only after we are done using it. This patch just moves the put_device() down a bit to avoid the use after free.
Fixes: 5c54fcac9a9d ("usb: roles: Take care of driver module reference counting") Signed-off-by: Wen Yang <wenyang@linux.alibaba.com> Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com> Reviewed-by: Peter Chen <peter.chen@nxp.com> Cc: stable <stable@vger.kernel.org> Cc: Hans de Goede <hdegoede@redhat.com> Cc: Chunfeng Yun <chunfeng.yun@mediatek.com> Cc: Suzuki K Poulose <suzuki.poulose@arm.com> Cc: linux-usb@vger.kernel.org Cc: linux-kernel@vger.kernel.org Link: https://lore.kernel.org/r/20191124142236.25671-1-wenyang@linux.alibaba.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- drivers/usb/roles/class.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/usb/roles/class.c +++ b/drivers/usb/roles/class.c @@ -169,8 +169,8 @@ EXPORT_SYMBOL_GPL(fwnode_usb_role_switch void usb_role_switch_put(struct usb_role_switch *sw) { if (!IS_ERR_OR_NULL(sw)) { - put_device(&sw->dev); module_put(sw->dev.parent->driver->owner); + put_device(&sw->dev); } } EXPORT_SYMBOL_GPL(usb_role_switch_put);
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