From: Paulo Alcantara <pc@manguebit.com>
Date: Thu, 27 Apr 2023 16:07:38 -0300
Subject: [PATCH] cifs: protect session status check in smb2_reconnect()
References: bsc#1012628
Patch-mainline: 6.3.2
Git-commit: 5bff9f741af60b143a5ae73417a8ec47fd5ff2f4
commit 5bff9f741af60b143a5ae73417a8ec47fd5ff2f4 upstream.
Use @ses->ses_lock to protect access of @ses->ses_status.
Cc: stable@vger.kernel.org
Signed-off-by: Paulo Alcantara (SUSE) <pc@manguebit.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
---
fs/cifs/smb2pdu.c | 15 +++++++++++----
1 file changed, 11 insertions(+), 4 deletions(-)
diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index 366f0c3b..8916190b 100644
--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -175,8 +175,17 @@ smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon,
}
}
spin_unlock(&tcon->tc_lock);
- if ((!tcon->ses) || (tcon->ses->ses_status == SES_EXITING) ||
- (!tcon->ses->server) || !server)
+
+ ses = tcon->ses;
+ if (!ses)
+ return -EIO;
+ spin_lock(&ses->ses_lock);
+ if (ses->ses_status == SES_EXITING) {
+ spin_unlock(&ses->ses_lock);
+ return -EIO;
+ }
+ spin_unlock(&ses->ses_lock);
+ if (!ses->server || !server)
return -EIO;
spin_lock(&server->srv_lock);
@@ -204,8 +213,6 @@ smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon,
if (rc)
return rc;
- ses = tcon->ses;
-
spin_lock(&ses->chan_lock);
if (!cifs_chan_needs_reconnect(ses, server) && !tcon->need_reconnect) {
spin_unlock(&ses->chan_lock);
--
2.35.3