cifs: Fix uninitialized memory read for smb311 posix symlink create

If smb311 posix is enabled, we send the intended mode for file
creation in the posix create context. Instead of using what's there on
the stack, create the mfsymlink file with 0644.

Fixes: ce558b0 ("smb3: Add posix create context for smb3.11 posix mounts")
Cc: [email protected]
Signed-off-by: Volker Lendecke <[email protected]>
Reviewed-by: Tom Talpey <[email protected]>
Reviewed-by: Paulo Alcantara (SUSE) <[email protected]>
Signed-off-by: Steve French <[email protected]>

Author: vlendec

fs/cifs/link.c

@@ -428,6 +428,7 @@ smb3_create_mf_symlink(unsigned int xid, struct cifs_tcon *tcon,
 	oparms.disposition = FILE_CREATE;
 	oparms.fid = &fid;
 	oparms.reconnect = false;
+	oparms.mode = 0644;
 
 	rc = SMB2_open(xid, &oparms, utf16_path, &oplock, NULL, NULL,
 		       NULL, NULL);