patch "USB: serial: oti6858: fix NULL-deref at open" added to usb-linus

patch "USB: serial: oti6858: fix NULL-deref at open" added to usb-linus

[gregkh]

This is a note to let you know that I've just added the patch titled

    USB: serial: oti6858: fix NULL-deref at open

to my usb git tree which can be found at
    git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git
in the usb-linus branch.

The patch will show up in the next release of the linux-next tree
(usually sometime within the next 24 hours during the week.)

The patch will hopefully also be merged in Linus's tree for the
next -rc kernel release.

If you have any questions about this process, please let me know.


>From 5afeef2366db14587b65558bbfd5a067542e07fb Mon Sep 17 00:00:00 2001
From: Johan Hovold <johan@kernel.org>
Date: Tue, 3 Jan 2017 16:39:59 +0100
Subject: USB: serial: oti6858: fix NULL-deref at open

Fix NULL-pointer dereference in open() should the device lack the
expected endpoints:

Unable to handle kernel NULL pointer dereference at virtual address 00000030
...
PC is at oti6858_open+0x30/0x1d0 [oti6858]

Note that a missing interrupt-in endpoint would have caused open() to
fail.

Fixes: 49cdee0ed0fc ("USB: oti6858 usb-serial driver (in Nokia CA-42
cable)")
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Johan Hovold <johan@kernel.org>
---
 drivers/usb/serial/oti6858.c | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/drivers/usb/serial/oti6858.c b/drivers/usb/serial/oti6858.c
index a4b88bc038b6..b8bf52bf7a94 100644
--- a/drivers/usb/serial/oti6858.c
+++ b/drivers/usb/serial/oti6858.c
@@ -134,6 +134,7 @@ static int oti6858_chars_in_buffer(struct tty_struct *tty);
 static int oti6858_tiocmget(struct tty_struct *tty);
 static int oti6858_tiocmset(struct tty_struct *tty,
 				unsigned int set, unsigned int clear);
+static int oti6858_attach(struct usb_serial *serial);
 static int oti6858_port_probe(struct usb_serial_port *port);
 static int oti6858_port_remove(struct usb_serial_port *port);
 
@@ -158,6 +159,7 @@ static struct usb_serial_driver oti6858_device = {
 	.write_bulk_callback =	oti6858_write_bulk_callback,
 	.write_room =		oti6858_write_room,
 	.chars_in_buffer =	oti6858_chars_in_buffer,
+	.attach =		oti6858_attach,
 	.port_probe =		oti6858_port_probe,
 	.port_remove =		oti6858_port_remove,
 };
@@ -324,6 +326,20 @@ static void send_data(struct work_struct *work)
 	usb_serial_port_softint(port);
 }
 
+static int oti6858_attach(struct usb_serial *serial)
+{
+	unsigned char num_ports = serial->num_ports;
+
+	if (serial->num_bulk_in < num_ports ||
+			serial->num_bulk_out < num_ports ||
+			serial->num_interrupt_in < num_ports) {
+		dev_err(&serial->interface->dev, "missing endpoints\n");
+		return -ENODEV;
+	}
+
+	return 0;
+}
+
 static int oti6858_port_probe(struct usb_serial_port *port)
 {
 	struct oti6858_private *priv;
-- 
2.11.0