patch "usb: roles: Take care of driver module reference counting" added to usb-linus

patch "usb: roles: Take care of driver module reference counting" added to usb-linus

[gregkh]

This is a note to let you know that I've just added the patch titled

    usb: roles: Take care of driver module reference counting

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 5c54fcac9a9de559b444ac63ec3cd82f1d157a0b Mon Sep 17 00:00:00 2001
From: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Date: Wed, 19 Sep 2018 10:58:05 +0300
Subject: usb: roles: Take care of driver module reference counting

This fixes potential "BUG: unable to handle kernel paging
request at ..." from happening.

Fixes: fde0aa6c175a ("usb: common: Small class for USB role switches")
Cc: <stable@vger.kernel.org>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Tested-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/usb/common/roles.c | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/drivers/usb/common/roles.c b/drivers/usb/common/roles.c
index 15cc76e22123..99116af07f1d 100644
--- a/drivers/usb/common/roles.c
+++ b/drivers/usb/common/roles.c
@@ -109,8 +109,15 @@ static void *usb_role_switch_match(struct device_connection *con, int ep,
  */
 struct usb_role_switch *usb_role_switch_get(struct device *dev)
 {
-	return device_connection_find_match(dev, "usb-role-switch", NULL,
-					    usb_role_switch_match);
+	struct usb_role_switch *sw;
+
+	sw = device_connection_find_match(dev, "usb-role-switch", NULL,
+					  usb_role_switch_match);
+
+	if (!IS_ERR_OR_NULL(sw))
+		WARN_ON(!try_module_get(sw->dev.parent->driver->owner));
+
+	return sw;
 }
 EXPORT_SYMBOL_GPL(usb_role_switch_get);
 
@@ -122,8 +129,10 @@ EXPORT_SYMBOL_GPL(usb_role_switch_get);
  */
 void usb_role_switch_put(struct usb_role_switch *sw)
 {
-	if (!IS_ERR_OR_NULL(sw))
+	if (!IS_ERR_OR_NULL(sw)) {
 		put_device(&sw->dev);
+		module_put(sw->dev.parent->driver->owner);
+	}
 }
 EXPORT_SYMBOL_GPL(usb_role_switch_put);
 
-- 
2.19.0