linux-kernel - [PATCH 5.15 171/179] cifs: nosharesock should be set on new server

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Message-Id: <20211129181724.557473832@linuxfoundation.org>
Date:   Mon, 29 Nov 2021 19:19:25 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Shyam Prasad N <sprasad@...rosoft.com>,
        "Paulo Alcantara (SUSE)" <pc@....nz>,
        Steve French <stfrench@...rosoft.com>
Subject: [PATCH 5.15 171/179] cifs: nosharesock should be set on new server

From: Shyam Prasad N <sprasad@...rosoft.com>

commit b9ad6b5b687e798746024e5fc4574d8fa8bdfade upstream.

Recent fix to maintain a nosharesock state on the
server struct caused a regression. It updated this
field in the old tcp session, and not the new one.

This caused the multichannel scenario to misbehave.

Fixes: c9f1c19cf7c5 (cifs: nosharesock should not share socket with future sessions)
Signed-off-by: Shyam Prasad N <sprasad@...rosoft.com>
Reviewed-by: Paulo Alcantara (SUSE) <pc@....nz>
Signed-off-by: Steve French <stfrench@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 fs/cifs/connect.c |    7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -1217,10 +1217,8 @@ static int match_server(struct TCP_Serve
 {
 	struct sockaddr *addr = (struct sockaddr *)&ctx->dstaddr;
 
-	if (ctx->nosharesock) {
-		server->nosharesock = true;
+	if (ctx->nosharesock)
 		return 0;
-	}
 
 	/* this server does not share socket */
 	if (server->nosharesock)
@@ -1376,6 +1374,9 @@ cifs_get_tcp_session(struct smb3_fs_cont
 		goto out_err;
 	}
 
+	if (ctx->nosharesock)
+		tcp_ses->nosharesock = true;
+
 	tcp_ses->ops = ctx->ops;
 	tcp_ses->vals = ctx->vals;
 	cifs_set_net_ns(tcp_ses, get_net(current->nsproxy->net_ns));