Messages in this thread Patch in this message | | | Date | Mon, 6 Oct 2008 16:17:59 -0700 | From | Greg KH <> | Subject | [patch 27/28] sctp: Fix oops when INIT-ACK indicates that peer doesnt support AUTH |
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2.6.25-stable review patch. If anyone has any objections, please let us know.
------------------ From: Vlad Yasevich <vladislav.yasevich@hp.com>
[ Upstream commit add52379dde2e5300e2d574b172e62c6cf43b3d3 ]
If INIT-ACK is received with SupportedExtensions parameter which indicates that the peer does not support AUTH, the packet will be silently ignore, and sctp_process_init() do cleanup all of the transports in the association. When T1-Init timer is expires, OOPS happen while we try to choose a different init transport.
The solution is to only clean up the non-active transports, i.e the ones that the peer added. However, that introduces a problem with sctp_connectx(), because we don't mark the proper state for the transports provided by the user. So, we'll simply mark user-provided transports as ACTIVE. That will allow INIT retransmissions to work properly in the sctp_connectx() context and prevent the crash.
Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
--- net/sctp/associola.c | 9 +++++---- net/sctp/sm_make_chunk.c | 6 ++---- 2 files changed, 7 insertions(+), 8 deletions(-)
--- a/net/sctp/associola.c +++ b/net/sctp/associola.c @@ -588,11 +588,12 @@ struct sctp_transport *sctp_assoc_add_pe /* Check to see if this is a duplicate. */ peer = sctp_assoc_lookup_paddr(asoc, addr); if (peer) { + /* An UNKNOWN state is only set on transports added by + * user in sctp_connectx() call. Such transports should be + * considered CONFIRMED per RFC 4960, Section 5.4. + */ if (peer->state == SCTP_UNKNOWN) { - if (peer_state == SCTP_ACTIVE) - peer->state = SCTP_ACTIVE; - if (peer_state == SCTP_UNCONFIRMED) - peer->state = SCTP_UNCONFIRMED; + peer->state = SCTP_ACTIVE; } return peer; } --- a/net/sctp/sm_make_chunk.c +++ b/net/sctp/sm_make_chunk.c @@ -2321,12 +2321,10 @@ clean_up: /* Release the transport structures. */ list_for_each_safe(pos, temp, &asoc->peer.transport_addr_list) { transport = list_entry(pos, struct sctp_transport, transports); - list_del_init(pos); - sctp_transport_free(transport); + if (transport->state != SCTP_ACTIVE) + sctp_assoc_rm_peer(asoc, transport); } - asoc->peer.transport_count = 0; - nomem: return 0; } --
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