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usb: typec: tcpci: fix of node refcount leak in tcpci_register_port() 

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/tcpc/connector

The 'fwnode' set in tcpci_parse_config() which is called
in tcpci_register_port(), its node refcount is increased
in device_get_named_child_node(). It needs be put while
exiting, so call fwnode_handle_put() in the error path of
tcpci_register_port() and in tcpci_unregister_port() to
avoid leak.

Fixes: 5e85a04c8c ("usb: typec: add fwnode to tcpc")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Acked-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Link: https://lore.kernel.org/r/20221121062416.1026192-1-yangyingliang@huawei.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Yang Yingliang 2022-11-21 14:24:16 +08:00 committed by Greg Kroah-Hartman
parent 6552ba4cd0
commit 0384e87e3f
1 changed files with 4 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
drivers/usb/typec/tcpm/tcpci.c
View File

@ -794,8 +794,10 @@ struct tcpci *tcpci_register_port(struct device *dev, struct tcpci_data *data)
return ERR_PTR(err); return ERR_PTR(err);
tcpci->port = tcpm_register_port(tcpci->dev, &tcpci->tcpc); tcpci->port = tcpm_register_port(tcpci->dev, &tcpci->tcpc);
if (IS_ERR(tcpci->port)) if (IS_ERR(tcpci->port)) {
fwnode_handle_put(tcpci->tcpc.fwnode);
return ERR_CAST(tcpci->port); return ERR_CAST(tcpci->port);
}
return tcpci; return tcpci;
} }
@ -804,6 +806,7 @@ EXPORT_SYMBOL_GPL(tcpci_register_port);
void tcpci_unregister_port(struct tcpci *tcpci) void tcpci_unregister_port(struct tcpci *tcpci)
{ {
tcpm_unregister_port(tcpci->port); tcpm_unregister_port(tcpci->port);
fwnode_handle_put(tcpci->tcpc.fwnode);
} }
EXPORT_SYMBOL_GPL(tcpci_unregister_port); EXPORT_SYMBOL_GPL(tcpci_unregister_port);