[PATCH 3.16 012/233] SMB2: Fix share type handling

[Ben Hutchings]

3.16.48-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Christophe JAILLET <christophe.jail...@wanadoo.fr>

commit cd1230070ae1c12fd34cf6a557bfa81bf9311009 upstream.

In fs/cifs/smb2pdu.h, we have:
#define SMB2_SHARE_TYPE_DISK    0x01
#define SMB2_SHARE_TYPE_PIPE    0x02
#define SMB2_SHARE_TYPE_PRINT   0x03

Knowing that, with the current code, the SMB2_SHARE_TYPE_PRINT case can
never trigger and printer share would be interpreted as disk share.

So, test the ShareType value for equality instead.

Fixes: faaf946a7d5b ("CIFS: Add tree connect/disconnect capability for SMB2")
Signed-off-by: Christophe JAILLET <christophe.jail...@wanadoo.fr>
Acked-by: Aurelien Aptel <aap...@suse.com>
Signed-off-by: Steve French <smfre...@gmail.com>
Signed-off-by: Ben Hutchings <b...@decadent.org.uk>
---
 fs/cifs/smb2pdu.c | 14 +++++++++-----
 1 file changed, 9 insertions(+), 5 deletions(-)

--- a/fs/cifs/smb2pdu.c
+++ b/fs/cifs/smb2pdu.c
@@ -904,15 +904,19 @@ SMB2_tcon(const unsigned int xid, struct
                goto tcon_exit;
        }
 
-       if (rsp->ShareType & SMB2_SHARE_TYPE_DISK)
+       switch (rsp->ShareType) {
+       case SMB2_SHARE_TYPE_DISK:
                cifs_dbg(FYI, "connection to disk share\n");
-       else if (rsp->ShareType & SMB2_SHARE_TYPE_PIPE) {
+               break;
+       case SMB2_SHARE_TYPE_PIPE:
                tcon->ipc = true;
                cifs_dbg(FYI, "connection to pipe share\n");
-       } else if (rsp->ShareType & SMB2_SHARE_TYPE_PRINT) {
-               tcon->print = true;
+               break;
+       case SMB2_SHARE_TYPE_PRINT:
+               tcon->ipc = true;
                cifs_dbg(FYI, "connection to printer\n");
-       } else {
+               break;
+       default:
                cifs_dbg(VFS, "unknown share type %d\n", rsp->ShareType);
                rc = -EOPNOTSUPP;
                goto tcon_error_exit;