linux-kernel - [PATCH 2.6.32 01/55] usb: serial: visor: fix crash on detecting device without write

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Message-Id: <20160304153000.747190867@1wt.eu>
Date:	Fri, 04 Mar 2016 16:30:01 +0100
From:	Willy Tarreau <w@....eu>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Ralf Spenneberg <ralf@...nneberg.net>,
	Vladis Dronov <vdronov@...hat.com>,
	Ben Hutchings <ben@...adent.org.uk>, Willy Tarreau <w@....eu>
Subject: [PATCH 2.6.32 01/55] usb: serial: visor: fix crash on detecting device
 without write_urbs

2.6.32-longterm review patch.  If anyone has any objections, please let me know.

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

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

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>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
Signed-off-by: Willy Tarreau <w@....eu>
---
 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 9af8c2f..e9229c5 100644
--- a/drivers/usb/serial/visor.c
+++ b/drivers/usb/serial/visor.c
@@ -921,8 +921,10 @@ 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 */
 	serial->port[0]->bulk_out_endpointAddress =
-- 
1.7.12.2.21.g234cd45.dirty