From 591071fab232bcde3584ad1fd1ed0f6fdc2fcdb5 Mon Sep 17 00:00:00 2001 From: Steve French Date: Thu, 24 Jun 2021 15:28:04 -0500 Subject: [PATCH] cifs: fix missing spinlock around update to ses->status In the other places where we update ses->status we protect the updates via GlobalMid_Lock. So to be consistent add the same locking around it in cifs_put_smb_ses where it was missing. Addresses-Coverity: 1268904 ("Data race condition") Signed-off-by: Steve French --- fs/cifs/cifsglob.h | 3 ++- fs/cifs/connect.c | 5 ++++- 2 files changed, 6 insertions(+), 2 deletions(-) diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h index 988346904fd0..fc6b08e5ebbc 100644 --- a/fs/cifs/cifsglob.h +++ b/fs/cifs/cifsglob.h @@ -887,7 +887,7 @@ struct cifs_ses { struct mutex session_mutex; struct TCP_Server_Info *server; /* pointer to server info */ int ses_count; /* reference counter */ - enum statusEnum status; + enum statusEnum status; /* updates protected by GlobalMid_Lock */ unsigned overrideSecFlg; /* if non-zero override global sec flags */ char *serverOS; /* name of operating system underlying server */ char *serverNOS; /* name of network operating system of server */ @@ -1785,6 +1785,7 @@ require use of the stronger protocol */ * list operations on pending_mid_q and oplockQ * updates to XID counters, multiplex id and SMB sequence numbers * list operations on global DnotifyReqList + * updates to ses->status * tcp_ses_lock protects: * list operations on tcp and SMB session lists * tcon->open_file_lock protects the list of open files hanging off the tcon diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c index c8079376d294..5d269f583dac 100644 --- a/fs/cifs/connect.c +++ b/fs/cifs/connect.c @@ -1598,9 +1598,12 @@ void cifs_put_smb_ses(struct cifs_ses *ses) spin_unlock(&cifs_tcp_ses_lock); return; } + spin_unlock(&cifs_tcp_ses_lock); + + spin_lock(&GlobalMid_Lock); if (ses->status == CifsGood) ses->status = CifsExiting; - spin_unlock(&cifs_tcp_ses_lock); + spin_unlock(&GlobalMid_Lock); cifs_free_ipc(ses); -- 2.30.2