linux-kernel - [PATCH 3.12 69/76] net: fix infoleak in rtnetlink

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Message-Id: <3248734d04fe4140b66aca5ce0372d7eae093293.1463648873.git.jslaby@suse.cz>
Date:	Thu, 19 May 2016 11:08:31 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Kangjie Lu <kangjielu@...il.com>,
	Kangjie Lu <kjlu@...ech.edu>,
	"David S . Miller" <davem@...emloft.net>,
	Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 69/76] net: fix infoleak in rtnetlink

From: Kangjie Lu <kangjielu@...il.com>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

[ Upstream commit 5f8e44741f9f216e33736ea4ec65ca9ac03036e6 ]

The stack object “map” has a total size of 32 bytes. Its last 4
bytes are padding generated by compiler. These padding bytes are
not initialized and sent out via “nla_put”.

Signed-off-by: Kangjie Lu <kjlu@...ech.edu>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 net/core/rtnetlink.c | 18 ++++++++++--------
 1 file changed, 10 insertions(+), 8 deletions(-)

diff --git a/net/core/rtnetlink.c b/net/core/rtnetlink.c
index fd3a16e45dd9..5093f42d7afc 100644
--- a/net/core/rtnetlink.c
+++ b/net/core/rtnetlink.c
@@ -950,14 +950,16 @@ static int rtnl_fill_ifinfo(struct sk_buff *skb, struct net_device *dev,
 		goto nla_put_failure;
 
 	if (1) {
-		struct rtnl_link_ifmap map = {
-			.mem_start   = dev->mem_start,
-			.mem_end     = dev->mem_end,
-			.base_addr   = dev->base_addr,
-			.irq         = dev->irq,
-			.dma         = dev->dma,
-			.port        = dev->if_port,
-		};
+		struct rtnl_link_ifmap map;
+
+		memset(&map, 0, sizeof(map));
+		map.mem_start   = dev->mem_start;
+		map.mem_end     = dev->mem_end;
+		map.base_addr   = dev->base_addr;
+		map.irq         = dev->irq;
+		map.dma         = dev->dma;
+		map.port        = dev->if_port;
+
 		if (nla_put(skb, IFLA_MAP, sizeof(map), &map))
 			goto nla_put_failure;
 	}
-- 
2.8.2