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bonding: validate ip header before check IPPROTO_IGMP

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bond_xmit_roundrobin() checks for IGMP packets but it parses
the IP header even before checking skb->protocol.

We should validate the IP header with pskb_may_pull() before
using iph->protocol.

Reported-and-tested-by: syzbot+e5be16aa39ad6e755391@syzkaller.appspotmail.com
Fixes: a2fd940f4c ("bonding: fix broken multicast with round-robin mode")
Cc: Jay Vosburgh <j.vosburgh@gmail.com>
Cc: Veaceslav Falico <vfalico@gmail.com>
Cc: Andy Gospodarek <andy@greyhouse.net>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Cong Wang 2019-07-01 20:40:24 -07:00 committed by David S. Miller
parent c3ead2df97
commit 9d1bc24b52
1 changed files with 23 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

37
drivers/net/bonding/bond_main.c
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@ -3866,8 +3866,8 @@ static netdev_tx_t bond_xmit_roundrobin(struct sk_buff *skb,
struct net_device *bond_dev)
{
struct bonding *bond = netdev_priv(bond_dev);
struct iphdr *iph = ip_hdr(skb);
struct slave *slave;
int slave_cnt;
u32 slave_id;
/* Start with the curr_active_slave that joined the bond as the
@ -3876,23 +3876,32 @@ static netdev_tx_t bond_xmit_roundrobin(struct sk_buff *skb,
* send the join/membership reports. The curr_active_slave found
* will send all of this type of traffic.
*/
if (iph->protocol == IPPROTO_IGMP && skb->protocol == htons(ETH_P_IP)) {
slave = rcu_dereference(bond->curr_active_slave);
if (slave)
bond_dev_queue_xmit(bond, skb, slave->dev);
else
bond_xmit_slave_id(bond, skb, 0);
} else {
int slave_cnt = READ_ONCE(bond->slave_cnt);
if (skb->protocol == htons(ETH_P_IP)) {
int noff = skb_network_offset(skb);
struct iphdr *iph;
if (likely(slave_cnt)) {
slave_id = bond_rr_gen_slave_id(bond);
bond_xmit_slave_id(bond, skb, slave_id % slave_cnt);
} else {
bond_tx_drop(bond_dev, skb);
if (unlikely(!pskb_may_pull(skb, noff + sizeof(*iph))))
goto non_igmp;
iph = ip_hdr(skb);
if (iph->protocol == IPPROTO_IGMP) {
slave = rcu_dereference(bond->curr_active_slave);
if (slave)
bond_dev_queue_xmit(bond, skb, slave->dev);
else
bond_xmit_slave_id(bond, skb, 0);
return NETDEV_TX_OK;
}
}
non_igmp:
slave_cnt = READ_ONCE(bond->slave_cnt);
if (likely(slave_cnt)) {
slave_id = bond_rr_gen_slave_id(bond);
bond_xmit_slave_id(bond, skb, slave_id % slave_cnt);
} else {
bond_tx_drop(bond_dev, skb);
}
return NETDEV_TX_OK;
}