linux-kernel - [PATCH 3.2 083/199] USB: serial: spcp8x5: fix NULL-deref at open

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Date:   Fri, 10 Mar 2017 11:46:10 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org, "Johan Hovold" <johan@...nel.org>
Subject: [PATCH 3.2 083/199] USB: serial: spcp8x5: fix NULL-deref at open

3.2.87-rc1 review patch.  If anyone has any objections, please let me know.

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

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>
[bwh: Backported to 3.2: add this check to the existing
 usb_serial_driver::attach implementation]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/usb/serial/spcp8x5.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

--- a/drivers/usb/serial/spcp8x5.c
+++ b/drivers/usb/serial/spcp8x5.c
@@ -176,6 +176,13 @@ static int spcp8x5_startup(struct usb_se
 	int i;
 	enum spcp8x5_type type = SPCP825_007_TYPE;
 	u16 product = le16_to_cpu(serial->dev->descriptor.idProduct);
+	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;
+	}
 
 	if (product == 0x0201)
 		type = SPCP825_007_TYPE;