net/core: check length before updating Ethertype in skb_mpls_{push,pop}

Openvswitch allows to drop a packet's Ethernet header, therefore
skb_mpls_push() and skb_mpls_pop() might be called with ethernet=true
and mac_len=0. In that case the pointer passed to skb_mod_eth_type()
doesn't point to an Ethernet header and the new Ethertype is written at
unexpected locations.

Fix this by verifying that mac_len is big enough to contain an Ethernet
header.

Fixes: fa4e0f8855fc ("net/sched: fix corrupted L2 header with MPLS 'push' and 'pop' actions")
Signed-off-by: Guillaume Nault <gnault@redhat.com>
Acked-by: Davide Caratti <dcaratti@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/core/skbuff.c b/net/core/skbuff.c
index 6faf73d..2b48cb0 100644 (file)
--- a/net/core/skbuff.c
+++ b/net/core/skbuff.c
@@ -5622,7 +5622,7 @@ int skb_mpls_push(struct sk_buff *skb, __be32 mpls_lse, __be16 mpls_proto,
        lse->label_stack_entry = mpls_lse;
        skb_postpush_rcsum(skb, lse, MPLS_HLEN);
 
-       if (ethernet)
+       if (ethernet && mac_len >= ETH_HLEN)
                skb_mod_eth_type(skb, eth_hdr(skb), mpls_proto);
        skb->protocol = mpls_proto;
 
@@ -5662,7 +5662,7 @@ int skb_mpls_pop(struct sk_buff *skb, __be16 next_proto, int mac_len,
        skb_reset_mac_header(skb);
        skb_set_network_header(skb, mac_len);
 
-       if (ethernet) {
+       if (ethernet && mac_len >= ETH_HLEN) {
                struct ethhdr *hdr;
 
                /* use mpls_hdr() to get ethertype to account for VLANs. */