From ab12811c89e88f2e66746790b1fe4469ccb7bdd9 Mon Sep 17 00:00:00 2001 From: Andy Gospodarek Date: Fri, 10 Sep 2010 11:43:20 +0000 Subject: [PATCH] bonding: correctly process non-linear skbs It was recently brought to my attention that 802.3ad mode bonds would no longer form when using some network hardware after a driver update. After snooping around I realized that the particular hardware was using page-based skbs and found that skb->data did not contain a valid LACPDU as it was not stored there. That explained the inability to form an 802.3ad-based bond. For balance-alb mode bonds this was also an issue as ARPs would not be properly processed. This patch fixes the issue in my tests and should be applied to 2.6.36 and as far back as anyone cares to add it to stable. Thanks to Alexander Duyck and Jesse Brandeburg for the suggestions on this one. Signed-off-by: Andy Gospodarek CC: Alexander Duyck CC: Jesse Brandeburg CC: stable@kerne.org Signed-off-by: Jay Vosburgh Signed-off-by: David S. Miller --- drivers/net/bonding/bond_3ad.c | 3 +++ drivers/net/bonding/bond_alb.c | 3 +++ 2 files changed, 6 insertions(+) diff --git a/drivers/net/bonding/bond_3ad.c b/drivers/net/bonding/bond_3ad.c index 822f586d72af..0ddf4c66afe2 100644 --- a/drivers/net/bonding/bond_3ad.c +++ b/drivers/net/bonding/bond_3ad.c @@ -2466,6 +2466,9 @@ int bond_3ad_lacpdu_recv(struct sk_buff *skb, struct net_device *dev, struct pac if (!(dev->flags & IFF_MASTER)) goto out; + if (!pskb_may_pull(skb, sizeof(struct lacpdu))) + goto out; + read_lock(&bond->lock); slave = bond_get_slave_by_dev((struct bonding *)netdev_priv(dev), orig_dev); diff --git a/drivers/net/bonding/bond_alb.c b/drivers/net/bonding/bond_alb.c index c746b331771d..26bb118c4533 100644 --- a/drivers/net/bonding/bond_alb.c +++ b/drivers/net/bonding/bond_alb.c @@ -362,6 +362,9 @@ static int rlb_arp_recv(struct sk_buff *skb, struct net_device *bond_dev, struct goto out; } + if (!pskb_may_pull(skb, arp_hdr_len(bond_dev))) + goto out; + if (skb->len < sizeof(struct arp_pkt)) { pr_debug("Packet is too small to be an ARP\n"); goto out; -- 2.39.5