Commit bec9640b authored by Vlad Yasevich's avatar Vlad Yasevich

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: default avatarVlad Yasevich <vladislav.yasevich@hp.com>
parent af87b823
......@@ -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. */
......
......@@ -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,
......
......@@ -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;
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment