From mboxrd@z Thu Jan 1 00:00:00 1970 From: Greg KH Subject: [11/27] gro: reset vlan_tci on reuse Date: Wed, 07 Dec 2011 08:54:44 -0800 Message-ID: <20111207165601.339899873@clark.kroah.org> References: <20111207165611.GA19872@kroah.com> Cc: , , , netdev@vger.kernel.org, Jesse Gross , Benjamin Poirier To: , , davem@davemloft.net Return-path: In-Reply-To: <20111207165611.GA19872@kroah.com> Sender: linux-kernel-owner@vger.kernel.org List-Id: netdev.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;