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cifs: fix missing spinlock around update to ses->status

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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>
This commit is contained in:
Steve French 2021-06-24 15:28:04 -05:00
parent 162004a2f7
commit 0060a4f28a
2 changed files with 6 additions and 2 deletions
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3
fs/cifs/cifsglob.h
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@ -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

5
fs/cifs/connect.c
View File

@ -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);