linux-kernel - [PATCH 3.12 050/142] USB: serial: visor: fix crash on detecting device without write

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Message-Id: <c88ff183d8a3b3599394885f458b40eb838c0850.1456308281.git.jslaby@suse.cz>
Date:	Wed, 24 Feb 2016 11:04:05 +0100
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Vladis Dronov <vdronov@...hat.com>,
	Johan Hovold <johan@...nel.org>, Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 050/142] USB: serial: visor: fix crash on detecting device without write_urbs

From: Vladis Dronov <vdronov@...hat.com>

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

===============

commit cb3232138e37129e88240a98a1d2aba2187ff57c upstream.

The visor driver crashes in clie_5_attach() when a specially crafted USB
device without bulk-out endpoint is detected. This fix adds a check that
the device has proper configuration expected by the driver.

Reported-by: Ralf Spenneberg <ralf@...nneberg.net>
Signed-off-by: Vladis Dronov <vdronov@...hat.com>
Fixes: cfb8da8f69b8 ("USB: visor: fix initialisation of UX50/TH55 devices")
Signed-off-by: Johan Hovold <johan@...nel.org>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 drivers/usb/serial/visor.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/usb/serial/visor.c b/drivers/usb/serial/visor.c
index 727905de0ba4..9c61a8671721 100644
--- a/drivers/usb/serial/visor.c
+++ b/drivers/usb/serial/visor.c
@@ -604,8 +604,10 @@ static int clie_5_attach(struct usb_serial *serial)
 	 */
 
 	/* some sanity check */
-	if (serial->num_ports < 2)
-		return -1;
+	if (serial->num_bulk_out < 2) {
+		dev_err(&serial->interface->dev, "missing bulk out endpoints\n");
+		return -ENODEV;
+	}
 
 	/* port 0 now uses the modified endpoint Address */
 	port = serial->port[0];
-- 
2.7.1