usb: roles: fix a potential use after free
commit5.4-rM2-2.2.x-imx-squashed1848a54319
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:5c54fcac9a
("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>
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ebedb73628
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76d915a1b1
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@ -169,8 +169,8 @@ EXPORT_SYMBOL_GPL(fwnode_usb_role_switch_get);
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void usb_role_switch_put(struct usb_role_switch *sw)
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{
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if (!IS_ERR_OR_NULL(sw)) {
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put_device(&sw->dev);
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module_put(sw->dev.parent->driver->owner);
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put_device(&sw->dev);
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}
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}
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EXPORT_SYMBOL_GPL(usb_role_switch_put);
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