The patch below does not apply to the 5.4-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
Thanks, Sasha
------------------ original commit in Linus's tree ------------------
From 13c0a74747cb7fdadf58c5d3a7d52cfca2d51736 Mon Sep 17 00:00:00 2001 From: Shyam Prasad N sprasad@microsoft.com Date: Wed, 13 Mar 2024 10:40:41 +0000 Subject: [PATCH] cifs: make sure server interfaces are requested only for SMB3+ MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit
Some code paths for querying server interfaces make a false assumption that it will only get called for SMB3+. Since this function now can get called from a generic code paths, the correct thing to do is to have specific handler for this functionality per SMB dialect, and call this handler.
This change adds such a handler and implements this handler only for SMB 3.0 and 3.1.1.
Cc: stable@vger.kernel.org Cc: Jan Čermák sairon@sairon.cz Reported-by: Paulo Alcantara pc@manguebit.com Signed-off-by: Shyam Prasad N sprasad@microsoft.com Signed-off-by: Steve French stfrench@microsoft.com --- fs/smb/client/cifsglob.h | 3 +++ fs/smb/client/connect.c | 6 +++++- fs/smb/client/smb2ops.c | 2 ++ fs/smb/client/smb2pdu.c | 5 +++-- 4 files changed, 13 insertions(+), 3 deletions(-)
diff --git a/fs/smb/client/cifsglob.h b/fs/smb/client/cifsglob.h index 8be62ed053a25..3da625d532359 100644 --- a/fs/smb/client/cifsglob.h +++ b/fs/smb/client/cifsglob.h @@ -355,6 +355,9 @@ struct smb_version_operations { /* informational QFS call */ void (*qfs_tcon)(const unsigned int, struct cifs_tcon *, struct cifs_sb_info *); + /* query for server interfaces */ + int (*query_server_interfaces)(const unsigned int, struct cifs_tcon *, + bool); /* check if a path is accessible or not */ int (*is_path_accessible)(const unsigned int, struct cifs_tcon *, struct cifs_sb_info *, const char *); diff --git a/fs/smb/client/connect.c b/fs/smb/client/connect.c index 86ae578904a26..4cbb79418e506 100644 --- a/fs/smb/client/connect.c +++ b/fs/smb/client/connect.c @@ -123,12 +123,16 @@ static void smb2_query_server_interfaces(struct work_struct *work) struct cifs_tcon *tcon = container_of(work, struct cifs_tcon, query_interfaces.work); + struct TCP_Server_Info *server = tcon->ses->server;
/* * query server network interfaces, in case they change */ + if (!server->ops->query_server_interfaces) + return; + xid = get_xid(); - rc = SMB3_request_interfaces(xid, tcon, false); + rc = server->ops->query_server_interfaces(xid, tcon, false); free_xid(xid);
if (rc) { diff --git a/fs/smb/client/smb2ops.c b/fs/smb/client/smb2ops.c index 6ee22d0dbc006..2ed456948f34c 100644 --- a/fs/smb/client/smb2ops.c +++ b/fs/smb/client/smb2ops.c @@ -5290,6 +5290,7 @@ struct smb_version_operations smb30_operations = { .tree_connect = SMB2_tcon, .tree_disconnect = SMB2_tdis, .qfs_tcon = smb3_qfs_tcon, + .query_server_interfaces = SMB3_request_interfaces, .is_path_accessible = smb2_is_path_accessible, .can_echo = smb2_can_echo, .echo = SMB2_echo, @@ -5405,6 +5406,7 @@ struct smb_version_operations smb311_operations = { .tree_connect = SMB2_tcon, .tree_disconnect = SMB2_tdis, .qfs_tcon = smb3_qfs_tcon, + .query_server_interfaces = SMB3_request_interfaces, .is_path_accessible = smb2_is_path_accessible, .can_echo = smb2_can_echo, .echo = SMB2_echo, diff --git a/fs/smb/client/smb2pdu.c b/fs/smb/client/smb2pdu.c index e5e6b14f8cae3..3ea688558e6c9 100644 --- a/fs/smb/client/smb2pdu.c +++ b/fs/smb/client/smb2pdu.c @@ -409,14 +409,15 @@ smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon, spin_unlock(&ses->ses_lock);
if (!rc && - (server->capabilities & SMB2_GLOBAL_CAP_MULTI_CHANNEL)) { + (server->capabilities & SMB2_GLOBAL_CAP_MULTI_CHANNEL) && + server->ops->query_server_interfaces) { mutex_unlock(&ses->session_mutex);
/* * query server network interfaces, in case they change */ xid = get_xid(); - rc = SMB3_request_interfaces(xid, tcon, false); + rc = server->ops->query_server_interfaces(xid, tcon, false); free_xid(xid);
if (rc == -EOPNOTSUPP && ses->chan_count > 1) {