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USB: ledtrig-usbport: fix of-node leak 

This code looks up a USB device node from a given parent USB device but
never dropped its reference to the returned node.

As only the address of the node is used for a later matching, the
reference can be dropped immediately.

Note that this trigger implementation confuses the description of the
USB device connected to a port with the port itself (which does not have
a device-tree representation).

Fixes: 4f04c210d0 ("usb: core: read USB ports from DT in the usbport LED trigger driver")
Cc: Rafał Miłecki <rafal@milecki.pl>
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johan Hovold 2017-11-09 18:07:22 +01:00 committed by Greg Kroah-Hartman
parent 1a7e3948cb
commit 03310a1548
1 changed files with 7 additions and 1 deletions
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8
drivers/usb/core/ledtrig-usbport.c
View File

@ -137,11 +137,17 @@ static bool usbport_trig_port_observed(struct usbport_trig_data *usbport_data,
if (!led_np)
return false;
/* Get node of port being added */
/*
* Get node of port being added
*
* FIXME: This is really the device node of the connected device
*/
port_np = usb_of_get_child_node(usb_dev->dev.of_node, port1);
if (!port_np)
return false;
of_node_put(port_np);
/* Amount of trigger sources for this LED */
count = of_count_phandle_with_args(led_np, "trigger-sources",
"#trigger-source-cells");