linux-kernel - [PATCH 4.9 03/36] kcm: Call strp_stop before strp_done in kcm

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Message-Id: <20180514064804.481050784@linuxfoundation.org>
Date:   Mon, 14 May 2018 08:48:37 +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+88dfb55e4c8b770d86e3@...kaller.appspotmail.com,
        Tom Herbert <tom@...ntonium.net>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 4.9 03/36] kcm: Call strp_stop before strp_done in kcm_attach

4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Tom Herbert <tom@...ntonium.net>

commit dff8baa261174de689a44572d0ea182d7aa70598 upstream.

In kcm_attach strp_done is called when sk_user_data is already
set to fail the attach. strp_done needs the strp to be stopped and
warns if it isn't. Call strp_stop in this case to eliminate the
warning message.

Reported-by: syzbot+88dfb55e4c8b770d86e3@...kaller.appspotmail.com
Fixes: e5571240236c5652f ("kcm: Check if sk_user_data already set in kcm_attach"
Signed-off-by: Tom Herbert <tom@...ntonium.net>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 net/kcm/kcmsock.c |    1 +
 1 file changed, 1 insertion(+)

--- a/net/kcm/kcmsock.c
+++ b/net/kcm/kcmsock.c
@@ -1424,6 +1424,7 @@ static int kcm_attach(struct socket *soc
 	 */
 	if (csk->sk_user_data) {
 		write_unlock_bh(&csk->sk_callback_lock);
+		strp_stop(&psock->strp);
 		strp_done(&psock->strp);
 		kmem_cache_free(kcm_psockp, psock);
 		err = -EALREADY;