diff options
| author | Eric Dumazet <eric.dumazet@gmail.com> | 2012-02-23 10:55:02 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2012-02-23 16:50:45 -0500 |
| commit | 03606895cd98c0a628b17324fd7b5ff15db7e3cd (patch) | |
| tree | 26aab95243f23a5d0cff45ee0d6afd1608afe5df /net/ipv4/xfrm4_mode_tunnel.c | |
| parent | 4a2258ddddefeef3291c0fc66437c73d84261a1e (diff) | |
ipsec: be careful of non existing mac headers
Niccolo Belli reported ipsec crashes in case we handle a frame without
mac header (atm in his case)
Before copying mac header, better make sure it is present.
Bugzilla reference: https://bugzilla.kernel.org/show_bug.cgi?id=42809
Reported-by: Niccolò Belli <darkbasic@linuxsystems.it>
Tested-by: Niccolò Belli <darkbasic@linuxsystems.it>
Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4/xfrm4_mode_tunnel.c')
| -rw-r--r-- | net/ipv4/xfrm4_mode_tunnel.c | 6 |
1 files changed, 2 insertions, 4 deletions
diff --git a/net/ipv4/xfrm4_mode_tunnel.c b/net/ipv4/xfrm4_mode_tunnel.c index 534972e114a..ed4bf11ef9f 100644 --- a/net/ipv4/xfrm4_mode_tunnel.c +++ b/net/ipv4/xfrm4_mode_tunnel.c @@ -66,7 +66,6 @@ static int xfrm4_mode_tunnel_output(struct xfrm_state *x, struct sk_buff *skb) static int xfrm4_mode_tunnel_input(struct xfrm_state *x, struct sk_buff *skb) { - const unsigned char *old_mac; int err = -EINVAL; if (XFRM_MODE_SKB_CB(skb)->protocol != IPPROTO_IPIP) @@ -84,10 +83,9 @@ static int xfrm4_mode_tunnel_input(struct xfrm_state *x, struct sk_buff *skb) if (!(x->props.flags & XFRM_STATE_NOECN)) ipip_ecn_decapsulate(skb); - old_mac = skb_mac_header(skb); - skb_set_mac_header(skb, -skb->mac_len); - memmove(skb_mac_header(skb), old_mac, skb->mac_len); skb_reset_network_header(skb); + skb_mac_header_rebuild(skb); + err = 0; out: |