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net: sctp: sctp_sf_do_prm_asoc: do SCTP_CMD_INIT_CHOOSE_TRANSPORT first 

While this currently cannot trigger any NULL pointer dereference in
sctp_seq_dump_local_addrs(), better change the order of commands to
prevent a future bug to happen. Although we first add SCTP_CMD_NEW_ASOC
and then set the SCTP_CMD_INIT_CHOOSE_TRANSPORT, it is okay for now,
since this primitive is only called by sctp_connect() or sctp_sendmsg()
with sctp_assoc_add_peer() set first. However, lets do this precaution
and first set the transport and then add it to the association hashlist
to prevent in future something to possibly triggering this.

Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
Acked-by: Vlad Yasevich <vyasevich@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Daniel Borkmann 2013-06-14 18:24:05 +02:00 committed by David S. Miller
parent f9e42b8535
commit 405426f6ca
1 changed files with 4 additions and 4 deletions
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8
net/sctp/sm_statefuns.c
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@ -4632,16 +4632,16 @@ sctp_disposition_t sctp_sf_do_prm_asoc(struct net *net,
if (!repl)
goto nomem;
/* Choose transport for INIT. */
sctp_add_cmd_sf(commands, SCTP_CMD_INIT_CHOOSE_TRANSPORT,
SCTP_CHUNK(repl));
/* Cast away the const modifier, as we want to just
* rerun it through as a sideffect.
*/
my_asoc = (struct sctp_association *)asoc;
sctp_add_cmd_sf(commands, SCTP_CMD_NEW_ASOC, SCTP_ASOC(my_asoc));
/* Choose transport for INIT. */
sctp_add_cmd_sf(commands, SCTP_CMD_INIT_CHOOSE_TRANSPORT,
SCTP_CHUNK(repl));
/* After sending the INIT, "A" starts the T1-init timer and
* enters the COOKIE-WAIT state.
*/