linux-kernel - [PATCH 3.16.y-ckt 060/165] USB: serial: fix potential use-after-free after failed probe

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Message-Id: <1427292138-7021-61-git-send-email-luis.henriques@canonical.com>
Date:	Wed, 25 Mar 2015 14:00:33 +0000
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Johan Hovold <johan@...nel.org>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.16.y-ckt 060/165] USB: serial: fix potential use-after-free after failed probe

3.16.7-ckt9 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Johan Hovold <johan@...nel.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@...nel.org>
Acked-by: Greg Kroah-Hartman <greg@...ah.com>
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 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 9374bd2aba20..5d8d86666b90 100644
--- a/drivers/usb/serial/bus.c
+++ b/drivers/usb/serial/bus.c
@@ -75,7 +75,7 @@ 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_with_autopm;
 	}
 
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