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authorVlad Yasevich <vladislav.yasevich@hp.com>2009-07-30 18:08:28 -0400
committerVlad Yasevich <vladislav.yasevich@hp.com>2009-09-04 18:20:56 -0400
commitbec9640bb0d451813b1bb1f2cc13a5bfb17c3e48 (patch)
tree8c44f18560570c7200eed1a92cd0d9fab6c2a4f2
parentaf87b823ca2b05257192e8d48dc686db6173d7b2 (diff)
sctp: Disallow new connection on a closing socket
If a socket has a lot of association that are in the process of of being closed/aborted, it is possible for a remote to establish new associations during the time period that the old ones are shutting down. If this was a result of a close() call, there will be no socket and will cause a memory leak. We'll prevent this by setting the socket state to CLOSING and disallow new associations when in this state. Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
-rw-r--r--include/net/sctp/constants.h2
-rw-r--r--net/sctp/sm_statefuns.c9
-rw-r--r--net/sctp/socket.c1
3 files changed, 11 insertions, 1 deletions
diff --git a/include/net/sctp/constants.h b/include/net/sctp/constants.h
index 8bc25f7b04c..af8c1508109 100644
--- a/include/net/sctp/constants.h
+++ b/include/net/sctp/constants.h
@@ -231,7 +231,7 @@ typedef enum {
SCTP_SS_LISTENING = TCP_LISTEN,
SCTP_SS_ESTABLISHING = TCP_SYN_SENT,
SCTP_SS_ESTABLISHED = TCP_ESTABLISHED,
- SCTP_SS_DISCONNECTING = TCP_CLOSING,
+ SCTP_SS_CLOSING = TCP_CLOSING,
} sctp_sock_state_t;
/* These functions map various type to printable names. */
diff --git a/net/sctp/sm_statefuns.c b/net/sctp/sm_statefuns.c
index 7288192f7df..50225dd2e6d 100644
--- a/net/sctp/sm_statefuns.c
+++ b/net/sctp/sm_statefuns.c
@@ -334,6 +334,15 @@ sctp_disposition_t sctp_sf_do_5_1B_init(const struct sctp_endpoint *ep,
if (!sctp_chunk_length_valid(chunk, sizeof(sctp_init_chunk_t)))
return sctp_sf_pdiscard(ep, asoc, type, arg, commands);
+ /* If the INIT is coming toward a closing socket, we'll send back
+ * and ABORT. Essentially, this catches the race of INIT being
+ * backloged to the socket at the same time as the user isses close().
+ * Since the socket and all its associations are going away, we
+ * can treat this OOTB
+ */
+ if (sctp_sstate(ep->base.sk, CLOSING))
+ return sctp_sf_tabort_8_4_8(ep, asoc, type, arg, commands);
+
/* Verify the INIT chunk before processing it. */
err_chunk = NULL;
if (!sctp_verify_init(asoc, chunk->chunk_hdr->type,
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index 971890dbfea..a7e544e3f28 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -1361,6 +1361,7 @@ SCTP_STATIC void sctp_close(struct sock *sk, long timeout)
sctp_lock_sock(sk);
sk->sk_shutdown = SHUTDOWN_MASK;
+ sk->sk_state = SCTP_SS_CLOSING;
ep = sctp_sk(sk)->ep;