[PATCH 5.4 133/168] cifs: fix uninitialised lease_key in open_shroot()

From: Greg Kroah-Hartman
Date: Tue Apr 28 2020 - 14:43:29 EST


From: Paulo Alcantara <pc@xxxxxx>

commit 0fe0781f29dd8ab618999e6bda33c782ebbdb109 upstream.

SMB2_open_init() expects a pre-initialised lease_key when opening a
file with a lease, so set pfid->lease_key prior to calling it in
open_shroot().

This issue was observed when performing some DFS failover tests and
the lease key was never randomly generated.

Signed-off-by: Paulo Alcantara (SUSE) <pc@xxxxxx>
Signed-off-by: Steve French <stfrench@xxxxxxxxxxxxx>
Reviewed-by: Ronnie Sahlberg <lsahlber@xxxxxxxxxx>
Reviewed-by: Aurelien Aptel <aaptel@xxxxxxxx>
CC: Stable <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
fs/cifs/smb2ops.c | 5 +++++
1 file changed, 5 insertions(+)

--- a/fs/cifs/smb2ops.c
+++ b/fs/cifs/smb2ops.c
@@ -664,6 +664,11 @@ int open_shroot(unsigned int xid, struct
if (smb3_encryption_required(tcon))
flags |= CIFS_TRANSFORM_REQ;

+ if (!server->ops->new_lease_key)
+ return -EIO;
+
+ server->ops->new_lease_key(pfid);
+
memset(rqst, 0, sizeof(rqst));
resp_buftype[0] = resp_buftype[1] = CIFS_NO_BUFFER;
memset(rsp_iov, 0, sizeof(rsp_iov));