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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Josef Bacik <josef@toxicpanda.com>,
        Mike Christie <mchristi@redhat.com>,
        Sun Ke <sunke32@huawei.com>, Jens Axboe <axboe@kernel.dk>
Subject: [PATCH 4.19 014/306] nbd:fix memory leak in nbd_get_socket()
Date:   Wed, 27 Nov 2019 21:27:44 +0100
Message-Id: <20191127203115.750394671@linuxfoundation.org>
In-Reply-To: <20191127203114.766709977@linuxfoundation.org>
References: <20191127203114.766709977@linuxfoundation.org>
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From: Sun Ke <sunke32@huawei.com>

commit dff10bbea4be47bdb615b036c834a275b7c68133 upstream.

Before returning NULL, put the sock first.

Cc: stable@vger.kernel.org
Fixes: cf1b2326b734 ("nbd: verify socket is supported during setup")
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: Mike Christie <mchristi@redhat.com>
Signed-off-by: Sun Ke <sunke32@huawei.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/block/nbd.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c
@@ -945,6 +945,7 @@ static struct socket *nbd_get_socket(str
 	if (sock->ops->shutdown == sock_no_shutdown) {
 		dev_err(disk_to_dev(nbd->disk), "Unsupported socket: shutdown callout must be supported.\n");
 		*err = -EINVAL;
+		sockfd_put(sock);
 		return NULL;
 	}