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 ~]#

index 652a1b6..b21f261 100644
@@ -32,8 +32,11 @@ static void dccp_get_info(struct sock *sk, struct tcp_info *info)
 	if (dp->dccps_hc_rx_ackvec != NULL)
 		info->tcpi_options |= TCPI_OPT_SACK;
 
-	ccid_hc_rx_get_info(dp->dccps_hc_rx_ccid, sk, info);
-	ccid_hc_tx_get_info(dp->dccps_hc_tx_ccid, sk, info);
+	if (dp->dccps_hc_rx_ccid != NULL)
+		ccid_hc_rx_get_info(dp->dccps_hc_rx_ccid, sk, info);
+
+	if (dp->dccps_hc_tx_ccid != NULL)
+		ccid_hc_tx_get_info(dp->dccps_hc_tx_ccid, sk, info);
 }
 
 static void dccp_diag_get_info(struct sock *sk, struct inet_diag_msg *r,

From: Arnaldo Carvalho de Melo <[email protected]>
Date: Wed, 17 Dec 2008 18:03:32 -0200

...

Applied to net-next-2.6, thanks!