diff options
| author | Arnaldo Carvalho de Melo <acme@redhat.com> | 2008-12-18 03:08:01 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2008-12-18 03:08:01 +0300 |
| commit | a693722aec4ce26fb46c21cf4bf4422484a397a7 (patch) | |
| tree | 003b408f7473bbc9804e185f850cf6f6017e7f1d /net/dccp | |
| parent | 9732d523212060c44a4723332bdc5ee429eeabc3 (diff) | |
| download | linux-a693722aec4ce26fb46c21cf4bf4422484a397a7.tar.xz | |
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')
| -rw-r--r-- | net/dccp/diag.c | 7 |
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, |