netdev - [PATCH v2 1/2] usb: gadget: g_ether: fix frame size check for 802.1Q

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Message-Id: <1352335159-8049-2-git-send-email-iancoolidge@gmail.com>
Date:	Wed,  7 Nov 2012 16:39:18 -0800
From:	Ian Coolidge <iancoolidge@...il.com>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Felipe Balbi <balbi@...com>, linux-usb@...r.kernel.org,
	netdev@...r.kernel.org
Cc:	Ian Coolidge <iancoolidge@...il.com>
Subject: [PATCH v2 1/2] usb: gadget: g_ether: fix frame size check for 802.1Q

Checking skb->len against ETH_FRAME_LEN assumes a 1514
ethernet frame size. With an 802.1Q VLAN header, ethernet
frame length can now be 1518. Validate frame length against that.

Signed-off-by: Ian Coolidge <iancoolidge@...il.com>
---
 drivers/usb/gadget/u_ether.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/drivers/usb/gadget/u_ether.c b/drivers/usb/gadget/u_ether.c
index 6458764..4ec3c0d 100644
--- a/drivers/usb/gadget/u_ether.c
+++ b/drivers/usb/gadget/u_ether.c
@@ -20,6 +20,7 @@
 #include <linux/ctype.h>
 #include <linux/etherdevice.h>
 #include <linux/ethtool.h>
+#include <linux/if_vlan.h>
 
 #include "u_ether.h"
 
@@ -295,7 +296,7 @@ static void rx_complete(struct usb_ep *ep, struct usb_request *req)
 		while (skb2) {
 			if (status < 0
 					|| ETH_HLEN > skb2->len
-					|| skb2->len > ETH_FRAME_LEN) {
+					|| skb2->len > VLAN_ETH_FRAME_LEN) {
 				dev->net->stats.rx_errors++;
 				dev->net->stats.rx_length_errors++;
 				DBG(dev, "rx length %d\n", skb2->len);
-- 
1.7.6.5

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