[PATCH 4.19 20/49] net: bridge: fix stale eth hdr pointer in br_dev_xmit

[Greg Kroah-Hartman]

From: Nikolay Aleksandrov <nikolay@xxxxxxxxxxxxxxxxxxx>

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@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Cc: Eduardo Vela <Nava> <evn@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 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) &&