[PATCH 074/241] USB: usb_wwan: fix bulk-urb allocation

[Herton Ronaldo Krzesinski]

3.5.7.2 -stable review patch.  If anyone has any objections, please let me know.

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

From: Johan Hovold <jhovold at gmail.com>

commit 8e493ca1767d4951ed1322abaa74d6edbca29918 upstream.

Make sure we do not allocate urbs if we do not have a bulk endpoint.

Legacy code used incorrect assumption to test for bulk endpoints.

Reported-by: Dan Carpenter <dan.carpenter at oracle.com>
Signed-off-by: Johan Hovold <jhovold at gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
[ herton: backport for 3.5: allocation splitted in attach (in
  usb_wwan_setup_urbs and usb_wwan_startup), so patch two
  locations with the size checking. ]
Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski at canonical.com>
---
 drivers/usb/serial/usb_wwan.c |   15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/drivers/usb/serial/usb_wwan.c b/drivers/usb/serial/usb_wwan.c
index f35971d..da28535 100644
--- a/drivers/usb/serial/usb_wwan.c
+++ b/drivers/usb/serial/usb_wwan.c
@@ -453,9 +453,6 @@ static struct urb *usb_wwan_setup_urb(struct usb_serial *serial, int endpoint,
 {
 	struct urb *urb;
 
-	if (endpoint == -1)
-		return NULL;	/* endpoint not needed */
-
 	urb = usb_alloc_urb(0, GFP_KERNEL);	/* No ISO */
 	if (urb == NULL) {
 		dbg("%s: alloc for endpoint %d failed.", __func__, endpoint);
@@ -483,6 +480,9 @@ static void usb_wwan_setup_urbs(struct usb_serial *serial)
 
 		/* Do indat endpoints first */
 		for (j = 0; j < N_IN_URB; ++j) {
+			if (!port->bulk_in_size)
+				break;
+
 			portdata->in_urbs[j] = usb_wwan_setup_urb(serial,
 								  port->
 								  bulk_in_endpointAddress,
@@ -496,6 +496,9 @@ static void usb_wwan_setup_urbs(struct usb_serial *serial)
 
 		/* outdat endpoints */
 		for (j = 0; j < N_OUT_URB; ++j) {
+			if (!port->bulk_out_size)
+				break;
+
 			portdata->out_urbs[j] = usb_wwan_setup_urb(serial,
 								   port->
 								   bulk_out_endpointAddress,
@@ -529,6 +532,9 @@ int usb_wwan_startup(struct usb_serial *serial)
 		init_usb_anchor(&portdata->delayed);
 
 		for (j = 0; j < N_IN_URB; j++) {
+			if (!port->bulk_in_size)
+				break;
+
 			buffer = (u8 *) __get_free_page(GFP_KERNEL);
 			if (!buffer)
 				goto bail_out_error;
@@ -536,6 +542,9 @@ int usb_wwan_startup(struct usb_serial *serial)
 		}
 
 		for (j = 0; j < N_OUT_URB; j++) {
+			if (!port->bulk_out_size)
+				break;
+
 			buffer = kmalloc(OUT_BUFLEN, GFP_KERNEL);
 			if (!buffer)
 				goto bail_out_error2;
-- 
1.7.9.5