From 943fb67b090212f1d3789eb7796b1c9045c62fd6 Mon Sep 17 00:00:00 2001 From: Steve French Date: Wed, 26 Apr 2023 22:01:31 -0500 Subject: cifs: missing lock when updating session status Coverity noted a place where we were not grabbing the ses_lock when setting (and checking) ses_status. Addresses-Coverity: 1536833 ("Data race condition (MISSING_LOCK)") Reviewed-by: Paulo Alcantara (SUSE) Reviewed-by: Bharath SM Signed-off-by: Steve French --- fs/cifs/connect.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) (limited to 'fs') diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c index 1cbb90587995..7bfef741f758 100644 --- a/fs/cifs/connect.c +++ b/fs/cifs/connect.c @@ -1916,18 +1916,22 @@ void cifs_put_smb_ses(struct cifs_ses *ses) /* ses_count can never go negative */ WARN_ON(ses->ses_count < 0); + spin_lock(&ses->ses_lock); if (ses->ses_status == SES_GOOD) ses->ses_status = SES_EXITING; - cifs_free_ipc(ses); - if (ses->ses_status == SES_EXITING && server->ops->logoff) { + spin_unlock(&ses->ses_lock); + cifs_free_ipc(ses); xid = get_xid(); rc = server->ops->logoff(xid, ses); if (rc) cifs_server_dbg(VFS, "%s: Session Logoff failure rc=%d\n", __func__, rc); _free_xid(xid); + } else { + spin_unlock(&ses->ses_lock); + cifs_free_ipc(ses); } spin_lock(&cifs_tcp_ses_lock); -- cgit v1.2.3