linux-kernel - [PATCH 3.10 043/250] USB: serial: spcp8x5: fix NULL-deref at open

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Message-Id: <1496876436-32402-44-git-send-email-w@1wt.eu>
Date:   Thu,  8 Jun 2017 00:57:09 +0200
From:   Willy Tarreau <w@....eu>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        linux@...ck-us.net
Cc:     Johan Hovold <johan@...nel.org>, Willy Tarreau <w@....eu>
Subject: [PATCH 3.10 043/250] USB: serial: spcp8x5: fix NULL-deref at open

From: Johan Hovold <johan@...nel.org>

commit cc0909248258f679c4bb4cd315565d40abaf6bc6 upstream.

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 spcp8x5_open+0x30/0xd0 [spcp8x5]

Fixes: 619a6f1d1423 ("USB: add usb-serial spcp8x5 driver")
Signed-off-by: Johan Hovold <johan@...nel.org>
Signed-off-by: Willy Tarreau <w@....eu>
---
 drivers/usb/serial/spcp8x5.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/usb/serial/spcp8x5.c b/drivers/usb/serial/spcp8x5.c
index 1694d4f..20f00bc 100644
--- a/drivers/usb/serial/spcp8x5.c
+++ b/drivers/usb/serial/spcp8x5.c
@@ -155,6 +155,19 @@ static int spcp8x5_probe(struct usb_serial *serial,
 	return 0;
 }
 
+static int spcp8x5_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) {
+		dev_err(&serial->interface->dev, "missing endpoints\n");
+		return -ENODEV;
+	}
+
+	return 0;
+}
+
 static int spcp8x5_port_probe(struct usb_serial_port *port)
 {
 	const struct usb_device_id *id = usb_get_serial_data(port->serial);
@@ -479,6 +492,7 @@ static struct usb_serial_driver spcp8x5_device = {
 	.tiocmget		= spcp8x5_tiocmget,
 	.tiocmset		= spcp8x5_tiocmset,
 	.probe			= spcp8x5_probe,
+	.attach			= spcp8x5_attach,
 	.port_probe		= spcp8x5_port_probe,
 	.port_remove		= spcp8x5_port_remove,
 };
-- 
2.8.0.rc2.1.gbe9624a