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Arnaldo Carvalho de Melo a693722aec dccp_diag: LISTEN sockets don't have CCIDs 
And thus when we try to use 'ss -danemi' on these sockets that have no
ccid blocks (data collected using systemtap after I fixed the problem):

dccp_diag_get_info sk=0xffff8801220a3100, dp->dccps_hc_rx_ccid=0x0000000000000000, dp->dccps_hc_tx_ccid=0x0000000000000000

We get an OOPS:

mica.ghostprotocols.net login: BUG: unable to handle kernel NULL pointer
dereferenc0
IP: [<ffffffffa0136082>] dccp_diag_get_info+0x82/0xc0 [dccp_diag]
PGD 12106f067 PUD 122488067 PMD 0
Oops: 0000 [#1] PREEMPT

Fix is trivial, and 'ss -d' is working again:

[root@mica ~]# ss -danemi
State   Recv-Q Send-Q   Local Address:Port   Peer Address:Port 
LISTEN  0      0                    *:5001              *:*
ino:7288 sk:220a3100ffff8801
	 mem:(r0,w0,f0,t0) cwnd:0 ssthresh:0
[root@mica ~]# 

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
 		2008-12-17 16:08:01 -08:00
..
9p net: remove redundant argument comments 2008-11-21 17:15:03 -08:00
802 hippi: convert driver to net_device_ops 2008-11-20 20:32:15 -08:00
8021q vlan: convert to net_device_ops 2008-11-19 22:42:41 -08:00
appletalk netdevice: safe convert to netdev_priv() #part-4 2008-11-12 23:39:10 -08:00
atm netdevice: Kill netdev->priv 2008-12-08 01:14:16 -08:00
ax25 ax25: join the return paths that free skb 2008-12-14 23:17:26 -08:00
bluetooth bt/rfcomm/tty: join error paths 2008-12-14 23:18:00 -08:00
bridge Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/kaber/nf-next-2.6 2008-11-28 02:19:15 -08:00
can can: merge error paths 2008-12-14 23:16:58 -08:00
core Phonet: allocate separate ARP type for GPRS over a Phonet pipe 2008-12-17 15:47:48 -08:00
dcb net: fix dcbnl_setnumtcs operation check 2008-12-15 01:06:23 -08:00
dccp dccp_diag: LISTEN sockets don't have CCIDs 2008-12-17 16:08:01 -08:00
decnet net: Make static 2008-12-10 15:18:31 -08:00
dsa net: Make static 2008-12-10 15:18:31 -08:00
econet
…
ethernet eth: Declare an optimized compare_ether_addr_64bits() function 2008-11-23 23:24:32 -08:00
ipv4 ipmr: merge common code 2008-12-16 01:15:11 -08:00
ipv6 ipv6: fix the outgoing interface selection order in udpv6_sendmsg() 2008-12-16 02:08:29 -08:00
ipx net: '&' redux 2008-11-03 18:21:05 -08:00
irda irda: merge exit paths 2008-12-14 23:18:30 -08:00
iucv
…
key netns PF_KEY: per-netns /proc/pfkey 2008-11-25 17:59:00 -08:00
lapb
…
llc net: remove redundant argument comments 2008-11-21 17:15:03 -08:00
mac80211 mac80211: misc cleanups 2008-12-12 14:45:27 -05:00
netfilter Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2008-12-15 20:03:50 -08:00
netlabel Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2008-12-15 20:03:50 -08:00
netlink netlink: allow empty nested attributes 2008-11-28 03:05:19 -08:00
netrom net: '&' redux 2008-11-03 18:21:05 -08:00
packet net: Make sure BHs are disabled in sock_prot_inuse_add() 2008-11-24 00:09:29 -08:00
phonet Phonet: get rid of deferred work on the transmission path 2008-12-17 15:48:50 -08:00
rfkill rfkill: strip pointless notifier chain 2008-12-12 14:45:25 -05:00
rose Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2008-11-26 23:48:40 -08:00
rxrpc net: Make static 2008-12-10 15:18:31 -08:00
sched Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2008-12-15 20:03:50 -08:00
sctp sctp: fix missing label when PROC_FS=n 2008-11-27 15:30:53 -08:00
sunrpc Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2008-12-15 20:03:50 -08:00
tipc tipc: trivial endian annotation in debug statement 2008-11-07 23:37:50 -08:00
unix Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2008-12-02 19:50:27 -08:00
wanrouter netdevice wanrouter: Convert directly reference of netdev->priv 2008-11-20 04:26:21 -08:00
wireless mac80211/cfg80211: check endianness in sparse runs 2008-12-12 14:01:35 -05:00
x25 net: '&' redux 2008-11-03 18:21:05 -08:00
xfrm xfrm: join error paths 2008-12-14 23:16:22 -08:00
Kconfig net/ieee80211 -> drivers/net/ipw2x00/libipw_* rename 2008-11-21 11:08:18 -05:00
Makefile DCB: fix kconfig option 2008-11-25 01:02:08 -08:00
TUNABLE
…
compat.c reintroduce accept4 2008-11-19 18:49:57 -08:00
nonet.c
…
socket.c Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/davem/net-2.6 2008-11-20 16:44:00 -08:00
sysctl_net.c
…