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

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Date:	Tue, 16 Jun 2015 16:35:11 +0800
From:	lizf@...nel.org
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Johan Hovold <johan@...nel.org>,
	Zefan Li <lizefan@...wei.com>
Subject: [PATCH 3.4 057/172] USB: serial: fix potential use-after-free after failed probe

From: Johan Hovold <johan@...nel.org>

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@...nel.org>
Acked-by: Greg Kroah-Hartman <greg@...ah.com>
[lizf: Backported to 3.4: adjust context]
Signed-off-by: Zefan Li <lizefan@...wei.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 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;
 	}
 
-- 
1.9.1

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