linux-kernel - [PATCH 4.9 054/102] sctp: change to hold sk after auth shkey is created successfully

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Date:   Mon,  8 Jul 2019 17:12:47 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        syzbot+afabda3890cc2f765041@...kaller.appspotmail.com,
        syzbot+276ca1c77a19977c0130@...kaller.appspotmail.com,
        Xin Long <lucien.xin@...il.com>,
        Neil Horman <nhorman@...hat.com>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.9 054/102] sctp: change to hold sk after auth shkey is created successfully

From: Xin Long <lucien.xin@...il.com>

[ Upstream commit 25bff6d5478b2a02368097015b7d8eb727c87e16 ]

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@...kaller.appspotmail.com
Reported-by: syzbot+276ca1c77a19977c0130@...kaller.appspotmail.com
Signed-off-by: Xin Long <lucien.xin@...il.com>
Acked-by: Neil Horman <nhorman@...hat.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/sctp/endpointola.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

--- a/net/sctp/endpointola.c
+++ b/net/sctp/endpointola.c
@@ -125,10 +125,6 @@ static struct sctp_endpoint *sctp_endpoi
 	/* 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);
 
@@ -165,6 +161,10 @@ static struct sctp_endpoint *sctp_endpoi
 	ep->auth_chunk_list = auth_chunks;
 	ep->prsctp_enable = net->sctp.prsctp_enable;
 
+	/* Remember who we are attached to.  */
+	ep->base.sk = sk;
+	sock_hold(ep->base.sk);
+
 	return ep;
 
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