diff options
| author | Stefano Brivio <sbrivio@redhat.com> | 2019-06-11 00:27:05 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2019-06-11 12:07:33 -0700 |
| commit | 8399a6930d12f5965230f4ff058228a4cc80c0b9 (patch) | |
| tree | e1efe7f840434d69d3d22d924def0ac30150e5b0 | |
| parent | 309b66970ee2abf721ecd0876a48940fa0b99a35 (diff) | |
vxlan: Don't assume linear buffers in error handler
In commit c3a43b9fec8a ("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 26fc181e6cac
("fou, fou6: do not assume linear skbs") and 5355ed6388e2 ("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: c3a43b9fec8a ("vxlan: ICMP error lookup handler")
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | drivers/net/vxlan.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/net/vxlan.c b/drivers/net/vxlan.c index 5994d5415a03..4c9bc29fe3d5 100644 --- a/drivers/net/vxlan.c +++ b/drivers/net/vxlan.c @@ -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); |