netns: oops in ip[6]_frag_reasm incrementing stats

dev can be NULL in ip[6]_frag_reasm for skb's coming from RAW sockets.

Quagga's OSPFD sends fragmented packets on a RAW socket, when netfilter
conntrack reassembles them on the OUTPUT path you hit this code path.

You can test it with something like "hping2 -0 -d 2000 -f AA.BB.CC.DD"

With help from Jarek Poplawski.

Signed-off-by: Jorge Boncompte [DTI2] <jorge@dti2.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 2 insertions, 1 deletions

diff --git a/net/ipv4/ip_fragment.c b/net/ipv4/ip_fragment.c
index 6659ac000eeb..7985346653bd 100644
--- a/net/ipv4/ip_fragment.c
+++ b/net/ipv4/ip_fragment.c
@@ -463,6 +463,7 @@ err:
 static int ip_frag_reasm(struct ipq *qp, struct sk_buff *prev,
                          struct net_device *dev)
 {
+        struct net *net = container_of(qp->q.net, struct net, ipv4.frags);
         struct iphdr *iph;
         struct sk_buff *fp, *head = qp->q.fragments;
         int len;
@@ -548,7 +549,7 @@ static int ip_frag_reasm(struct ipq *qp, struct sk_buff *prev,
         iph = ip_hdr(head);
         iph->frag_off = 0;
         iph->tot_len = htons(len);
-        IP_INC_STATS_BH(dev_net(dev), IPSTATS_MIB_REASMOKS);
+        IP_INC_STATS_BH(net, IPSTATS_MIB_REASMOKS);
         qp->q.fragments = NULL;
         return 0;