linux-kernel - [PATCH 3.16 155/346] USB: serial: fix memleak in driver-registration error path

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Message-ID: <lsq.1479082460.346010857@decadent.org.uk>
Date:   Mon, 14 Nov 2016 00:14:20 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Johan Hovold" <johan@...nel.org>,
        "Alexey Klimov" <klimov.linux@...il.com>,
        "Alan Stern" <stern@...land.harvard.edu>
Subject: [PATCH 3.16 155/346] USB: serial: fix memleak in driver-registration
 error path

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

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

From: Alexey Klimov <klimov.linux@...il.com>

commit 647024a7df36014bbc4479d92d88e6b77c0afcf6 upstream.

udriver struct allocated by kzalloc() will not be freed
if usb_register() and next calls fail. This patch fixes this
by adding one more step with kfree(udriver) in error path.

Signed-off-by: Alexey Klimov <klimov.linux@...il.com>
Acked-by: Alan Stern <stern@...land.harvard.edu>
Signed-off-by: Johan Hovold <johan@...nel.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/usb/serial/usb-serial.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/usb/serial/usb-serial.c
+++ b/drivers/usb/serial/usb-serial.c
@@ -1416,7 +1416,7 @@ int usb_serial_register_drivers(struct u
 
 	rc = usb_register(udriver);
 	if (rc)
-		return rc;
+		goto failed_usb_register;
 
 	for (sd = serial_drivers; *sd; ++sd) {
 		(*sd)->usb_driver = udriver;
@@ -1434,6 +1434,8 @@ int usb_serial_register_drivers(struct u
 	while (sd-- > serial_drivers)
 		usb_serial_deregister(*sd);
 	usb_deregister(udriver);
+failed_usb_register:
+	kfree(udriver);
 	return rc;
 }
 EXPORT_SYMBOL_GPL(usb_serial_register_drivers);