From: Shyam Prasad N <sprasad@microsoft.com>
Date: Tue, 6 Feb 2024 15:00:47 +0000
Subject: [PATCH] cifs: handle cases where multiple sessions share connection
References: bsc#1218260
Patch-mainline: 6.6.19
Git-commit: a39c757bf0596b17482a507f31c3ef0af0d1d2b4

[ Upstream commit a39c757bf0596b17482a507f31c3ef0af0d1d2b4 ]

Based on our implementation of multichannel, it is entirely
possible that a server struct may not be found in any channel
of an SMB session.

In such cases, we should be prepared to move on and search for
the server struct in the next session.

Signed-off-by: Shyam Prasad N <sprasad@microsoft.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Robert Frohl <rfrohl@suse.com>
---
 fs/smb/client/connect.c | 6 ++++++
 fs/smb/client/sess.c    | 1 -
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/fs/smb/client/connect.c b/fs/smb/client/connect.c
index c19eae07fa69..a4147e999736 100644
--- a/fs/smb/client/connect.c
+++ b/fs/smb/client/connect.c
@@ -229,6 +229,12 @@ cifs_mark_tcp_ses_conns_for_reconnect(struct TCP_Server_Info *server,
 	list_for_each_entry_safe(ses, nses, &pserver->smb_ses_list, smb_ses_list) {
 		/* check if iface is still active */
 		spin_lock(&ses->chan_lock);
+		if (cifs_ses_get_chan_index(ses, server) ==
+		    CIFS_INVAL_CHAN_INDEX) {
+			spin_unlock(&ses->chan_lock);
+			continue;
+		}
+
 		if (!cifs_chan_is_iface_active(ses, server)) {
 			spin_unlock(&ses->chan_lock);
 			cifs_chan_update_iface(ses, server);
diff --git a/fs/smb/client/sess.c b/fs/smb/client/sess.c
index 52f7a411e2bb..07726b456a0a 100644
--- a/fs/smb/client/sess.c
+++ b/fs/smb/client/sess.c
@@ -88,7 +88,6 @@ cifs_ses_get_chan_index(struct cifs_ses *ses,
 	if (server)
 		cifs_dbg(VFS, "unable to get chan index for server: 0x%llx",
 			 server->conn_id);
-	WARN_ON(1);
 	return CIFS_INVAL_CHAN_INDEX;
 }
 
-- 
2.43.0