From: Nikolay Aleksandrov nikolay@cumulusnetworks.com
commit 823d81b0fa2cd83a640734e74caee338b5d3c093 upstream.
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: 057658cb33fb ("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 Cc: Eduardo Vela <Nava> evn@google.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- net/bridge/br_device.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-)
--- a/net/bridge/br_device.c +++ b/net/bridge/br_device.c @@ -39,7 +39,6 @@ netdev_tx_t br_dev_xmit(struct sk_buff * struct pcpu_sw_netstats *brstats = this_cpu_ptr(br->stats); const struct nf_br_ops *nf_ops; const unsigned char *dest; - struct ethhdr *eth; u16 vid = 0;
memset(skb->cb, 0, sizeof(struct br_input_skb_cb)); @@ -60,15 +59,14 @@ netdev_tx_t br_dev_xmit(struct sk_buff * BR_INPUT_SKB_CB(skb)->brdev = dev;
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)) 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->neigh_suppress_enabled) { br_do_proxy_suppress_arp(skb, br, vid, NULL); } else if (IS_ENABLED(CONFIG_IPV6) &&