From: Steve French stfrench@microsoft.com
[ Upstream commit 0060a4f28a9ef45ae8163c0805e944a2b1546762 ]
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 stfrench@microsoft.com Signed-off-by: Sasha Levin sashal@kernel.org --- 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 248ee81e0151..6599069be690 100644 --- a/fs/cifs/cifsglob.h +++ b/fs/cifs/cifsglob.h @@ -979,7 +979,7 @@ 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 */ @@ -1863,6 +1863,7 @@ 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 aabaebd1535f..fb7088d57e46 100644 --- a/fs/cifs/connect.c +++ b/fs/cifs/connect.c @@ -2829,9 +2829,12 @@ 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);