This is a note to let you know that I've just added the patch titled
usb: roles: fix of node refcount leak in usb_role_switch_is_parent()
to the 5.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
usb-roles-fix-of-node-refcount-leak-in-usb_role_swit.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit c2b0e746439d3071decf85741115129a39bfe279
Author: Yang Yingliang <yangyingliang@xxxxxxxxxx>
Date: Tue Nov 22 19:12:26 2022 +0800
usb: roles: fix of node refcount leak in usb_role_switch_is_parent()
[ Upstream commit 1ab30c610630da5391a373cddb8a065bf4c4bc01 ]
I got the following report while doing device(mt6370-tcpc) load
test with CONFIG_OF_UNITTEST and CONFIG_OF_DYNAMIC enabled:
OF: ERROR: memory leak, expected refcount 1 instead of 2,
of_node_get()/of_node_put() unbalanced - destroy cset entry:
attach overlay node /i2c/pmic@34
The 'parent' returned by fwnode_get_parent() with refcount incremented.
it needs be put after using.
Fixes: 6fadd72943b8 ("usb: roles: get usb-role-switch from parent")
Reviewed-by: Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
Signed-off-by: Yang Yingliang <yangyingliang@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20221122111226.251588-1-yangyingliang@xxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/drivers/usb/roles/class.c b/drivers/usb/roles/class.c
index 97e3d75b19a3..873d89823f5b 100644
--- a/drivers/usb/roles/class.c
+++ b/drivers/usb/roles/class.c
@@ -108,10 +108,13 @@ usb_role_switch_is_parent(struct fwnode_handle *fwnode)
struct fwnode_handle *parent = fwnode_get_parent(fwnode);
struct device *dev;
- if (!parent || !fwnode_property_present(parent, "usb-role-switch"))
+ if (!fwnode_property_present(parent, "usb-role-switch")) {
+ fwnode_handle_put(parent);
return NULL;
+ }
dev = class_find_device_by_fwnode(role_class, parent);
+ fwnode_handle_put(parent);
return dev ? to_role_switch(dev) : ERR_PTR(-EPROBE_DEFER);
}
