linux-kernel - [34-longterm 058/196] NET: cdc-phonet, handle empty phonet header

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Date:	Mon, 12 Mar 2012 20:19:31 -0400
From:	Paul Gortmaker <paul.gortmaker@...driver.com>
To:	stable@...nel.org, linux-kernel@...r.kernel.org
Cc:	stable-review@...nel.org, Jiri Slaby <jslaby@...e.cz>,
	Rémi Denis-Courmont 
	<remi.denis-courmont@...ia.com>,
	"David S. Miller" <davem@...emloft.net>,
	Paul Gortmaker <paul.gortmaker@...driver.com>
Subject: [34-longterm 058/196] NET: cdc-phonet, handle empty phonet header

From: Jiri Slaby <jslaby@...e.cz>

                   -------------------
    This is a commit scheduled for the next v2.6.34 longterm release.
    If you see a problem with using this for longterm, please comment.
                   -------------------

commit 468c3f924f043cad7a04f4f4d5224a2c9bc886c1 upstream.

Currently, for N 5800 XM I get:
cdc_phonet: probe of 1-6:1.10 failed with error -22

It's because phonet_header is empty. Extra altsetting looks like
there:
E 05 24 00 01 10 03 24 ab 05 24 06 0a 0b 04 24 fd  .$....$..$....$.
E 00                                               .

I don't see the header used anywhere so just check if the phonet
descriptor is there, not the structure itself.

Signed-off-by: Jiri Slaby <jslaby@...e.cz>
Cc: Rémi Denis-Courmont <remi.denis-courmont@...ia.com>
Cc: David S. Miller <davem@...emloft.net>
Acked-by: Rémi Denis-Courmont <remi.denis-courmont@...ia.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Paul Gortmaker <paul.gortmaker@...driver.com>
---
 drivers/net/usb/cdc-phonet.c |    9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/drivers/net/usb/cdc-phonet.c b/drivers/net/usb/cdc-phonet.c
index dc94445..b18cda4 100644
--- a/drivers/net/usb/cdc-phonet.c
+++ b/drivers/net/usb/cdc-phonet.c
@@ -326,13 +326,13 @@ int usbpn_probe(struct usb_interface *intf, const struct usb_device_id *id)
 {
 	static const char ifname[] = "usbpn%d";
 	const struct usb_cdc_union_desc *union_header = NULL;
-	const struct usb_cdc_header_desc *phonet_header = NULL;
 	const struct usb_host_interface *data_desc;
 	struct usb_interface *data_intf;
 	struct usb_device *usbdev = interface_to_usbdev(intf);
 	struct net_device *dev;
 	struct usbpn_dev *pnd;
 	u8 *data;
+	int phonet = 0;
 	int len, err;
 
 	data = intf->altsetting->extra;
@@ -353,10 +353,7 @@ int usbpn_probe(struct usb_interface *intf, const struct usb_device_id *id)
 					(struct usb_cdc_union_desc *)data;
 				break;
 			case 0xAB:
-				if (phonet_header || dlen < 5)
-					break;
-				phonet_header =
-					(struct usb_cdc_header_desc *)data;
+				phonet = 1;
 				break;
 			}
 		}
@@ -364,7 +361,7 @@ int usbpn_probe(struct usb_interface *intf, const struct usb_device_id *id)
 		len -= dlen;
 	}
 
-	if (!union_header || !phonet_header)
+	if (!union_header || !phonet)
 		return -EINVAL;
 
 	data_intf = usb_ifnum_to_if(usbdev, union_header->bSlaveInterface0);
-- 
1.7.9.3

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