Commit 48fb6b55 authored by Wei-Chun Chao's avatar Wei-Chun Chao Committed by David S. Miller

ipv6: fix crash over flow-based vxlan device

Similar check was added in ip_rcv but not in ipv6_rcv.

BUG: unable to handle kernel NULL pointer dereference at (null)
IP: [<ffffffff81734e0a>] ipv6_rcv+0xfa/0x500
Call Trace:
[<ffffffff816c9786>] ? ip_rcv+0x296/0x400
[<ffffffff817732d2>] ? packet_rcv+0x52/0x410
[<ffffffff8168e99f>] __netif_receive_skb_core+0x63f/0x9a0
[<ffffffffc02b34a0>] ? br_handle_frame_finish+0x580/0x580 [bridge]
[<ffffffff8109912c>] ? update_rq_clock.part.81+0x1c/0x40
[<ffffffff8168ed18>] __netif_receive_skb+0x18/0x60
[<ffffffff8168fa1f>] process_backlog+0x9f/0x150

Fixes: ee122c79 (vxlan: Flow based tunneling)
Signed-off-by: default avatarWei-Chun Chao <weichunc@plumgrid.com>
Acked-by: default avatarThomas Graf <tgraf@suug.ch>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 6ac9de5f
...@@ -45,6 +45,7 @@ ...@@ -45,6 +45,7 @@
#include <net/addrconf.h> #include <net/addrconf.h>
#include <net/xfrm.h> #include <net/xfrm.h>
#include <net/inet_ecn.h> #include <net/inet_ecn.h>
#include <net/dst_metadata.h>
int ip6_rcv_finish(struct sock *sk, struct sk_buff *skb) int ip6_rcv_finish(struct sock *sk, struct sk_buff *skb)
{ {
...@@ -55,7 +56,7 @@ int ip6_rcv_finish(struct sock *sk, struct sk_buff *skb) ...@@ -55,7 +56,7 @@ int ip6_rcv_finish(struct sock *sk, struct sk_buff *skb)
if (ipprot && ipprot->early_demux) if (ipprot && ipprot->early_demux)
ipprot->early_demux(skb); ipprot->early_demux(skb);
} }
if (!skb_dst(skb)) if (!skb_valid_dst(skb))
ip6_route_input(skb); ip6_route_input(skb);
return dst_input(skb); return dst_input(skb);
...@@ -98,7 +99,7 @@ int ipv6_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt ...@@ -98,7 +99,7 @@ int ipv6_rcv(struct sk_buff *skb, struct net_device *dev, struct packet_type *pt
* arrived via the sending interface (ethX), because of the * arrived via the sending interface (ethX), because of the
* nature of scoping architecture. --yoshfuji * nature of scoping architecture. --yoshfuji
*/ */
IP6CB(skb)->iif = skb_dst(skb) ? ip6_dst_idev(skb_dst(skb))->dev->ifindex : dev->ifindex; IP6CB(skb)->iif = skb_valid_dst(skb) ? ip6_dst_idev(skb_dst(skb))->dev->ifindex : dev->ifindex;
if (unlikely(!pskb_may_pull(skb, sizeof(*hdr)))) if (unlikely(!pskb_may_pull(skb, sizeof(*hdr))))
goto err; goto err;
......
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