net/rds: Fix info leak in rds6_inc_info_copy()

The rds6_inc_info_copy() function has a couple struct members which
are leaking stack information. The ->tos field should hold actual
information and the ->flags field needs to be zeroed out.

Fixes: 3eb450367d08 ("rds: add type of service(tos) infrastructure")
Fixes: b7ff8b1036f0 ("rds: Extend RDS API for IPv6 support")
Reported-by: 黄ID蝴蝶 <[e-mail]>
Signed-off-by: Dan Carpenter <[e-mail]>
Signed-off-by: Ka-Cheong Poon <[e-mail]>
Acked-by: Santosh Shilimkar <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

net/rds/recv.c

···
 /*
- * Copyright (c) 2006, 2018 Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2006, 2019 Oracle and/or its affiliates. All rights reserved.
  *
  * This software is available to you under a choice of one of two
  * licenses.  You may choose to be licensed under the terms of the GNU
···
 
 	minfo6.seq = be64_to_cpu(inc->i_hdr.h_sequence);
 	minfo6.len = be32_to_cpu(inc->i_hdr.h_len);
+	minfo6.tos = inc->i_conn->c_tos;
 
 	if (flip) {
 		minfo6.laddr = *daddr;
···
 		minfo6.lport = inc->i_hdr.h_sport;
 		minfo6.fport = inc->i_hdr.h_dport;
 	}
+
+	minfo6.flags = 0;
 
 	rds_info_copy(iter, &minfo6, sizeof(minfo6));
 }