[PATCH 3.2 070/221] USB: serial: fix potential use-after-free after failed probe

Ben Hutchings
2015-05-05T01:44:19Z

From: Johan Hovold <johan@kernel.org>

commit 07fdfc5e9f1c966be8722e8fa927e5ea140df5ce upstream.

Fix return value in probe error path, which could end up returning
success (0) on errors. This could in turn lead to use-after-free or
double free (e.g. in port_remove) when the port device is removed.

Fixes: c706ebdfc895 ("USB: usb-serial: call port_probe and port_remove
at the right times")
Signed-off-by: Johan Hovold <johan@kernel.org>
Acked-by: Greg Kroah-Hartman <greg@kroah.com>
[bwh: Backported to 3.2: adjust context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---
drivers/usb/serial/bus.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/usb/serial/bus.c
+++ b/drivers/usb/serial/bus.c
@@ -73,7 +73,7 @@ static int usb_serial_device_probe(struc
retval = device_create_file(dev, &dev_attr_port_number);
if (retval) {
if (driver->port_remove)
- retval = driver->port_remove(port);
+ driver->port_remove(port);
goto exit;
}