From: Vladis Dronov <vdronov@redhat.com>
Date: Tue, 12 Jan 2016 14:10:50 +0000 (+0100)
Subject: USB: serial: visor: fix crash on detecting device without write_urbs
X-Git-Tag: v4.4.14-KARO~1584
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=2dc803d0740f0c493a7db8a1baf6514d5b95b6a3;p=karo-tx-linux.git

USB: serial: visor: fix crash on detecting device without write_urbs

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@spenneberg.net>
Signed-off-by: Vladis Dronov <vdronov@redhat.com>
Fixes: cfb8da8f69b8 ("USB: visor: fix initialisation of UX50/TH55 devices")
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/usb/serial/visor.c b/drivers/usb/serial/visor.c
index 60afb39eb73c..bbc90c059002 100644
--- a/drivers/usb/serial/visor.c
+++ b/drivers/usb/serial/visor.c
@@ -597,8 +597,10 @@ 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];