linux-kernel - [PATCH 3.2 071/199] USB: serial: iuu

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Message-ID: <lsq.1489146370.29491732@decadent.org.uk>
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 3.2 071/199] USB: serial: iuu_phoenix: 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 90507d54f712d81b74815ef3a4bbb555cd9fab2f upstream.

Fix NULL-pointer dereference at open should the device lack a bulk-in or
bulk-out endpoint:

Unable to handle kernel NULL pointer dereference at virtual address 00000030
...
PC is at iuu_open+0x78/0x59c [iuu_phoenix]

Fixes: 07c3b1a10016 ("USB: remove broken usb-serial num_endpoints
check")
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>
---
--- a/drivers/usb/serial/iuu_phoenix.c
+++ b/drivers/usb/serial/iuu_phoenix.c
@@ -112,7 +112,12 @@ static int iuu_alloc_buf(struct iuu_priv
 
 static int iuu_startup(struct usb_serial *serial)
 {
+	unsigned char num_ports = serial->num_ports;
 	struct iuu_private *priv;
+
+	if (serial->num_bulk_in < num_ports || serial->num_bulk_out < num_ports)
+		return -ENODEV;
+
 	priv = kzalloc(sizeof(struct iuu_private), GFP_KERNEL);
 	dbg("%s- priv allocation success", __func__);
 	if (!priv)