This is a note to let you know that I've just added the patch titled
usb: roles: fix a potential use after free
to my usb git tree which can be found at git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git in the usb-linus branch.
The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)
The patch will hopefully also be merged in Linus's tree for the next -rc kernel release.
If you have any questions about this process, please let me know.
From 1848a543191ae32e558bb0a5974ae7c38ebd86fc Mon Sep 17 00:00:00 2001
From: Wen Yang wenyang@linux.alibaba.com Date: Sun, 24 Nov 2019 22:22:36 +0800 Subject: usb: roles: fix a potential use after free
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(-)
diff --git a/drivers/usb/roles/class.c b/drivers/usb/roles/class.c index 8273126ffdf4..63a00ff26655 100644 --- a/drivers/usb/roles/class.c +++ b/drivers/usb/roles/class.c @@ -169,8 +169,8 @@ EXPORT_SYMBOL_GPL(fwnode_usb_role_switch_get); 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);