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From f9dbb3666b3ddb5f9a7e44a433383cb6880a03f5 Mon Sep 17 00:00:00 2001
From: Oliver Neukum <oneukum@suse.com>
Date: Thu, 31 Mar 2016 12:04:24 -0400
Subject: USB: mct_u232: add sanity checking in probe
commit 4e9a0b05257f29cf4b75f3209243ed71614d062e upstream.
An attack using the lack of sanity checking in probe is known. This
patch checks for the existence of a second port.
CVE: CVE-2016-3136
Upstream-Status: Backport
Signed-off-by: Oliver Neukum <ONeukum@suse.com>
[johan: add error message ]
Signed-off-by: Johan Hovold <johan@kernel.org>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Signed-off-by: Sona Sarmadi <sona.sarmadi@enea.com>
---
drivers/usb/serial/mct_u232.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/drivers/usb/serial/mct_u232.c b/drivers/usb/serial/mct_u232.c
index 6a15adf..c14c29f 100644
--- a/drivers/usb/serial/mct_u232.c
+++ b/drivers/usb/serial/mct_u232.c
@@ -377,14 +377,21 @@ static void mct_u232_msr_to_state(struct usb_serial_port *port,
static int mct_u232_port_probe(struct usb_serial_port *port)
{
+ struct usb_serial *serial = port->serial;
struct mct_u232_private *priv;
+ /* check first to simplify error handling */
+ if (!serial->port[1] || !serial->port[1]->interrupt_in_urb) {
+ dev_err(&port->dev, "expected endpoint missing\n");
+ return -ENODEV;
+ }
+
priv = kzalloc(sizeof(*priv), GFP_KERNEL);
if (!priv)
return -ENOMEM;
/* Use second interrupt-in endpoint for reading. */
- priv->read_urb = port->serial->port[1]->interrupt_in_urb;
+ priv->read_urb = serial->port[1]->interrupt_in_urb;
priv->read_urb->context = port;
spin_lock_init(&priv->lock);
--
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