[PATCH 3.4 057/172] USB: serial: fix potential use-after-free after failed probe

From: lizf
Date: Tue Jun 16 2015 - 04:44:13 EST

From: Johan Hovold <johan@xxxxxxxxxx>

3.4.108-rc1 review patch. If anyone has any objections, please let me know.


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@xxxxxxxxxx>
Acked-by: Greg Kroah-Hartman <greg@xxxxxxxxx>
[lizf: Backported to 3.4: adjust context]
Signed-off-by: Zefan Li <lizefan@xxxxxxxxxx>
drivers/usb/serial/bus.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/usb/serial/bus.c b/drivers/usb/serial/bus.c
index ed8adb0..1b59665 100644
--- a/drivers/usb/serial/bus.c
+++ b/drivers/usb/serial/bus.c
@@ -71,7 +71,7 @@ static int usb_serial_device_probe(struct device *dev)
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;


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