linux-kernel - [RFC 03/13] cifs: Fix oops due to uncleared server->smbd

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Date:   Wed, 25 Jan 2023 21:45:33 +0000
From:   David Howells <dhowells@...hat.com>
To:     Steve French <smfrench@...il.com>
Cc:     David Howells <dhowells@...hat.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        Shyam Prasad N <nspmangalore@...il.com>,
        Rohith Surabattula <rohiths.msft@...il.com>,
        Tom Talpey <tom@...pey.com>,
        Stefan Metzmacher <metze@...ba.org>,
        Christoph Hellwig <hch@...radead.org>,
        Matthew Wilcox <willy@...radead.org>,
        Jeff Layton <jlayton@...nel.org>, linux-cifs@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        Long Li <longli@...rosoft.com>,
        Pavel Shilovsky <pshilov@...rosoft.com>,
        Ronnie Sahlberg <lsahlber@...hat.com>
Subject: [RFC 03/13] cifs: Fix oops due to uncleared server->smbd_conn in reconnect

In smbd_destroy(), clear the server->smbd_conn pointer after freeing the
smbd_connection struct that it points to so that reconnection doesn't get
confused.

Fixes: 8ef130f9ec27 ("CIFS: SMBD: Implement function to destroy a SMB Direct connection")
Signed-off-by: David Howells <dhowells@...hat.com>
cc: Long Li <longli@...rosoft.com>
cc: Steve French <smfrench@...il.com>
cc: Pavel Shilovsky <pshilov@...rosoft.com>
cc: Ronnie Sahlberg <lsahlber@...hat.com>
cc: linux-cifs@...r.kernel.org
---
 fs/cifs/smbdirect.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/fs/cifs/smbdirect.c b/fs/cifs/smbdirect.c
index 90789aaa6567..8c816b25ce7c 100644
--- a/fs/cifs/smbdirect.c
+++ b/fs/cifs/smbdirect.c
@@ -1405,6 +1405,7 @@ void smbd_destroy(struct TCP_Server_Info *server)
 	destroy_workqueue(info->workqueue);
 	log_rdma_event(INFO,  "rdma session destroyed\n");
 	kfree(info);
+	server->smbd_conn = NULL;
 }
 
 /*