sctp: change to hold sk after auth shkey is created successfully

Now in sctp_endpoint_init(), it holds the sk then creates auth
shkey. But when the creation fails, it doesn't release the sk,
which causes a sk defcnf leak,

Here to fix it by only holding the sk when auth shkey is created
successfully.

Fixes: a29a5bd4f5c3 ("[SCTP]: Implement SCTP-AUTH initializations.")
Reported-by: syzbot+afabda3890cc2f765041@syzkaller.appspotmail.com
Reported-by: syzbot+276ca1c77a19977c0130@syzkaller.appspotmail.com
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Acked-by: Neil Horman <nhorman@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/sctp/endpointola.c b/net/sctp/endpointola.c
index e358437..69cebb2 100644 (file)
--- a/net/sctp/endpointola.c
+++ b/net/sctp/endpointola.c
@@ -118,10 +118,6 @@ static struct sctp_endpoint *sctp_endpoint_init(struct sctp_endpoint *ep,
        /* Initialize the bind addr area */
        sctp_bind_addr_init(&ep->base.bind_addr, 0);
 
-       /* Remember who we are attached to.  */
-       ep->base.sk = sk;
-       sock_hold(ep->base.sk);
-
        /* Create the lists of associations.  */
        INIT_LIST_HEAD(&ep->asocs);
 
@@ -154,6 +150,10 @@ static struct sctp_endpoint *sctp_endpoint_init(struct sctp_endpoint *ep,
        ep->prsctp_enable = net->sctp.prsctp_enable;
        ep->reconf_enable = net->sctp.reconf_enable;
 
+       /* Remember who we are attached to.  */
+       ep->base.sk = sk;
+       sock_hold(ep->base.sk);
+
        return ep;
 
 nomem_shkey: