From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757287Ab1LGRDA (ORCPT ); Wed, 7 Dec 2011 12:03:00 -0500 Received: from cantor2.suse.de ([195.135.220.15]:39265 "EHLO mx2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755557Ab1LGRC6 (ORCPT ); Wed, 7 Dec 2011 12:02:58 -0500 X-Mailbox-Line: From gregkh@clark.kroah.org Wed Dec 7 08:56:01 2011 Message-Id: <20111207165601.339899873@clark.kroah.org> User-Agent: quilt/0.50-23.1 Date: Wed, 07 Dec 2011 08:54:44 -0800 From: Greg KH To: , , davem@davemloft.net Cc: , , , netdev@vger.kernel.org, Jesse Gross , Benjamin Poirier Subject: [11/27] gro: reset vlan_tci on reuse In-Reply-To: <20111207165611.GA19872@kroah.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 2.6.32-longterm review patch. If anyone has any objections, please let me know. ------------------ This one liner is part of upstream commit 3701e51382a026cba10c60b03efabe534fba4ca4 Author: Jesse Gross vlan: Centralize handling of hardware acceleration. The bulk of that commit is a rework of the hardware assisted vlan tagging driver interface, and as such doesn't classify for -stable inclusion. The fix that is needed is a part of that commit but can work independently of the rest. This patch can avoid panics on the 2.6.32.y -stable kernels and is in the same spirit as mainline commits 66c46d7 gro: Reset dev pointer on reuse 6d152e2 gro: reset skb_iif on reuse which are already in -stable. For drivers using the vlan_gro_frags() interface, a packet with an invalid tci leads to GRO_DROP and napi_reuse_skb(). The skb has to be sanitized before being reused or we may send an skb with an invalid vlan_tci field up the stack where it is not expected. Signed-off-by: Benjamin Poirier Cc: Jesse Gross Acked-by: David S. Miller --- net/core/dev.c | 1 + 1 file changed, 1 insertion(+) --- a/net/core/dev.c +++ b/net/core/dev.c @@ -2614,6 +2614,7 @@ void napi_reuse_skb(struct napi_struct * { __skb_pull(skb, skb_headlen(skb)); skb_reserve(skb, NET_IP_ALIGN - skb_headroom(skb)); + skb->vlan_tci = 0; skb->dev = napi->dev; skb->iif = 0;