smb3: fix refcount underflow warning on unmount when no directory leases
Fix refcount underflow warning when unmounting to servers which didn't grant directory leases. [ 301.680095] refcount_t: underflow; use-after-free. [ 301.680192] WARNING: CPU: 1 PID: 3569 at lib/refcount.c:28 refcount_warn_saturate+0xb4/0xf3 ... [ 301.682139] Call Trace: [ 301.682240] close_shroot+0x97/0xda [cifs] [ 301.682351] SMB2_tdis+0x7c/0x176 [cifs] [ 301.682456] ? _get_xid+0x58/0x91 [cifs] [ 301.682563] cifs_put_tcon.part.0+0x99/0x202 [cifs] [ 301.682637] ? ida_free+0x99/0x10a [ 301.682727] ? cifs_umount+0x3d/0x9d [cifs] [ 301.682829] cifs_put_tlink+0x3a/0x50 [cifs] [ 301.682929] cifs_umount+0x44/0x9d [cifs] Fixes: 72e73c78 ("cifs: close the shared root handle on tree disconnect") Signed-off-by: NSteve French <stfrench@microsoft.com> Acked-by: NRonnie Sahlberg <lsahlber@redhat.com> Reviewed-by: NAurelien Aptel <aaptel@suse.com> Reviewed-by: NPavel Shilovsky <pshilov@microsoft.com> Reported-and-tested-by: NArthur Marsh <arthur.marsh@internode.on.net>
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