linux-kernel - [PATCH] nbd: error out if socket index doesn't match in nbd_handle

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Message-ID: <20211101092538.1155842-1-yukuai3@huawei.com>
Date:   Mon, 1 Nov 2021 17:25:38 +0800
From:   Yu Kuai <yukuai3@...wei.com>
To:     <josef@...icpanda.com>, <axboe@...nel.dk>
CC:     <linux-block@...r.kernel.org>, <nbd@...er.debian.org>,
        <linux-kernel@...r.kernel.org>, <yukuai3@...wei.com>,
        <yi.zhang@...wei.com>
Subject: [PATCH] nbd: error out if socket index doesn't match in nbd_handle_reply()

commit fcf3d633d8e1 ("nbd: check sock index in nbd_read_stat()") just
add error message when socket index doesn't match. Since the request
and reply must be transmitted over the same socket, it's ok to error
out in such situation.

Signed-off-by: Yu Kuai <yukuai3@...wei.com>
---
 drivers/block/nbd.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/block/nbd.c b/drivers/block/nbd.c
index b47b2a87ae8f..18da6385645c 100644
--- a/drivers/block/nbd.c
+++ b/drivers/block/nbd.c
@@ -755,6 +755,8 @@ static struct nbd_cmd *nbd_handle_reply(struct nbd_device *nbd, int index,
 	if (cmd->index != index) {
 		dev_err(disk_to_dev(nbd->disk), "Unexpected reply %d from different sock %d (expected %d)",
 			tag, index, cmd->index);
+		ret = -ENOENT;
+		goto out;
 	}
 	if (cmd->cmd_cookie != nbd_handle_to_cookie(handle)) {
 		dev_err(disk_to_dev(nbd->disk), "Double reply on req %p, cmd_cookie %u, handle cookie %u\n",
-- 
2.31.1