[PATCH 5.2 19/94] net/rds: Fix info leak in rds6_inc_info_copy()

[Greg Kroah-Hartman]

From: Ka-Cheong Poon <ka-cheong.poon@xxxxxxxxxx>

[ Upstream commit 7d0a06586b2686ba80c4a2da5f91cb10ffbea736 ]

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: éIDèè <butterflyhuangxx@xxxxxxxxx>
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
Signed-off-by: Ka-Cheong Poon <ka-cheong.poon@xxxxxxxxxx>
Acked-by: Santosh Shilimkar <santosh.shilimkar@xxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 net/rds/recv.c |    5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

--- a/net/rds/recv.c
+++ b/net/rds/recv.c
@@ -1,5 +1,5 @@
 /*
- * 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
@@ -811,6 +811,7 @@ void rds6_inc_info_copy(struct rds_incom
 
 	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;
@@ -824,6 +825,8 @@ void rds6_inc_info_copy(struct rds_incom
 		minfo6.fport = inc->i_hdr.h_dport;
 	}
 
+	minfo6.flags = 0;
+
 	rds_info_copy(iter, &minfo6, sizeof(minfo6));
 }
 #endif