linux-kernel - [PATCH 3.16 157/370] USB: serial: io

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Date:   Fri, 10 Mar 2017 11:46:22 +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 3.16 157/370] USB: serial: io_edgeport: fix NULL-deref at open

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

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

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

commit 0dd408425eb21ddf26a692b3c8044c9e7d1a7948 upstream.

Fix NULL-pointer dereference when initialising URBs at open should a
non-EPIC device lack a bulk-in or interrupt-in endpoint.

Unable to handle kernel NULL pointer dereference at virtual address 00000028
...
PC is at edge_open+0x24c/0x3e8 [io_edgeport]

Note that the EPIC-device probe path has the required sanity checks so
this makes those checks partially redundant.

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Johan Hovold <johan@...nel.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/usb/serial/io_edgeport.c | 5 +++++
 1 file changed, 5 insertions(+)

--- a/drivers/usb/serial/io_edgeport.c
+++ b/drivers/usb/serial/io_edgeport.c
@@ -2761,6 +2761,11 @@ static int edge_startup(struct usb_seria
 					EDGE_COMPATIBILITY_MASK1,
 					EDGE_COMPATIBILITY_MASK2 };
 
+	if (serial->num_bulk_in < 1 || serial->num_interrupt_in < 1) {
+		dev_err(&serial->interface->dev, "missing endpoints\n");
+		return -ENODEV;
+	}
+
 	dev = serial->dev;
 
 	/* create our private serial structure */