diff mbox series

[3/7] cifs: protect session status check in smb2_reconnect()

Message ID 20230503222117.7609-4-pc@manguebit.com
State New
Headers show
Series cifs.ko fixes | expand

Commit Message

Paulo Alcantara May 3, 2023, 10:21 p.m. UTC 
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>
---
 fs/cifs/smb2pdu.c | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)
diff mbox series

Patch

diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c
index 4245249dbba8..6a9661f3d324 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);