linux-kernel - [v2] nbd:fix memory leak in nbd_get

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Message-ID: <1574143751-138680-1-git-send-email-sunke32@huawei.com>
Date:   Tue, 19 Nov 2019 14:09:11 +0800
From:   Sun Ke <sunke32@...wei.com>
To:     <sunke32@...wei.com>, <josef@...icpanda.com>, <axboe@...nel.dk>,
        <linux-block@...r.kernel.org>, <nbd@...er.debian.org>,
        <linux-kernel@...r.kernel.org>
CC:     <stable@...r.kernel.org>
Subject: [v2] nbd:fix memory leak in nbd_get_socket()

Before return NULL,put the sock first.

Cc: stable@...r.kernel.org
Fixes: cf1b2326b734 ("nbd: verify socket is supported during setup")
Signed-off-by: Sun Ke <sunke32@...wei.com>
---
v2: add cc:stable tag
---
 drivers/block/nbd.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
index a94ee45..19e7599 100644
--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c
@@ -993,6 +993,7 @@ static struct socket *nbd_get_socket(struct nbd_device *nbd, unsigned long fd,
 	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;
 	}
 
-- 
2.7.4