net: bridge: fix stale eth hdr pointer in br_dev_xmit

In br_dev_xmit() we perform vlan filtering in br_allowed_ingress() but
if the packet has the vlan header inside (e.g. bridge with disabled
tx-vlan-offload) then the vlan filtering code will use skb_vlan_untag()
to extract the vid before filtering which in turn calls pskb_may_pull()
and we may end up with a stale eth pointer. Moreover the cached eth header
pointer will generally be wrong after that operation. Remove the eth header
caching and just use eth_hdr() directly, the compiler does the right thing
and calculates it only once so we don't lose anything.

Fixes: 202852da5a7c ("bridge: suppress arp pkts on BR_NEIGH_SUPPRESS ports")
Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/bridge/br_device.c b/net/bridge/br_device.c
index dc3d2c1dd9d54ca0a2a9a888b53996bb844b03f9..0e3dbc5f3c34f83203ffafcb944a89fed8043b25 100644 (file)
--- a/net/bridge/br_device.c
+++ b/net/bridge/br_device.c
@@ -34,7 +34,6 @@ netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev)
        const struct nf_br_ops *nf_ops;
        u8 state = BR_STATE_FORWARDING;
        const unsigned char *dest;
-       struct ethhdr *eth;
        u16 vid = 0;
 
        rcu_read_lock();
@@ -54,15 +53,14 @@ netdev_tx_t br_dev_xmit(struct sk_buff *skb, struct net_device *dev)
        BR_INPUT_SKB_CB(skb)->frag_max_size = 0;
 
        skb_reset_mac_header(skb);
-       eth = eth_hdr(skb);
        skb_pull(skb, ETH_HLEN);
 
        if (!br_allowed_ingress(br, br_vlan_group_rcu(br), skb, &vid, &state))
                goto out;
 
        if (IS_ENABLED(CONFIG_INET) &&
-           (eth->h_proto == htons(ETH_P_ARP) ||
-            eth->h_proto == htons(ETH_P_RARP)) &&
+           (eth_hdr(skb)->h_proto == htons(ETH_P_ARP) ||
+            eth_hdr(skb)->h_proto == htons(ETH_P_RARP)) &&
            br_opt_get(br, BROPT_NEIGH_SUPPRESS_ENABLED)) {
                br_do_proxy_suppress_arp(skb, br, vid, NULL);
        } else if (IS_ENABLED(CONFIG_IPV6) &&