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vxlan: Don't assume linear buffers in error handler

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In commit c3a43b9fec ("vxlan: ICMP error lookup handler") I wrongly
assumed buffers from icmp_socket_deliver() would be linear. This is not
the case: icmp_socket_deliver() only guarantees we have 8 bytes of linear
data.

Eric fixed this same issue for fou and fou6 in commits 26fc181e6c
("fou, fou6: do not assume linear skbs") and 5355ed6388 ("fou, fou6:
avoid uninit-value in gue_err() and gue6_err()").

Use pskb_may_pull() instead of checking skb->len, and take into account
the fact we later access the VXLAN header with udp_hdr(), so we also
need to sum skb_transport_header() here.

Reported-by: Guillaume Nault <gnault@redhat.com>
Fixes: c3a43b9fec ("vxlan: ICMP error lookup handler")
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Stefano Brivio 2019-06-11 00:27:05 +02:00 committed by David S. Miller
parent 309b66970e
commit 8399a6930d
1 changed files with 1 additions and 1 deletions
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2
drivers/net/vxlan.c
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@ -1766,7 +1766,7 @@ static int vxlan_err_lookup(struct sock *sk, struct sk_buff *skb)
struct vxlanhdr *hdr;
__be32 vni;
if (skb->len < VXLAN_HLEN)
if (!pskb_may_pull(skb, skb_transport_offset(skb) + VXLAN_HLEN))
return -EINVAL;
hdr = vxlan_hdr(skb);