path: root/net/dccp/diag.c
diff options
authorArnaldo Carvalho de Melo <acme@redhat.com>2008-12-17 16:08:01 -0800
committerDavid S. Miller <davem@davemloft.net>2008-12-17 16:08:01 -0800
commita693722aec4ce26fb46c21cf4bf4422484a397a7 (patch)
tree003b408f7473bbc9804e185f850cf6f6017e7f1d /net/dccp/diag.c
parentPhonet: USB CDC Phonet function for gadget framework (diff)
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>
Diffstat (limited to 'net/dccp/diag.c')
1 files changed, 5 insertions, 2 deletions
diff --git a/net/dccp/diag.c b/net/dccp/diag.c
index 652a1b67f727..b21f261da75e 100644
--- a/net/dccp/diag.c
+++ b/net/dccp/diag.c
@@ -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,