linux-kernel - [PATCH] tipc: fix an infoleak in tipc_nl_compat_link

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Message-Id: <1464854696-29513-1-git-send-email-kjlu@gatech.edu>
Date:	Thu,  2 Jun 2016 04:04:56 -0400
From:	Kangjie Lu <kangjielu@...il.com>
To:	jon.maloy@...csson.com
Cc:	ying.xue@...driver.com, davem@...emloft.net,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	taesoo@...ech.edu, csong84@...ech.edu, Kangjie Lu <kjlu@...ech.edu>
Subject: [PATCH] tipc: fix an infoleak in tipc_nl_compat_link_dump

link_info.str is a char array of size 60. Memory after the NULL
byte is not initialized. Sending the whole object out can cause
a leak.

Signed-off-by: Kangjie Lu <kjlu@...ech.edu>
---
 net/tipc/netlink_compat.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/net/tipc/netlink_compat.c b/net/tipc/netlink_compat.c
index f795b1d..2518014 100644
--- a/net/tipc/netlink_compat.c
+++ b/net/tipc/netlink_compat.c
@@ -604,7 +604,8 @@ static int tipc_nl_compat_link_dump(struct tipc_nl_compat_msg *msg,
 
 	link_info.dest = nla_get_flag(link[TIPC_NLA_LINK_DEST]);
 	link_info.up = htonl(nla_get_flag(link[TIPC_NLA_LINK_UP]));
-	strcpy(link_info.str, nla_data(link[TIPC_NLA_LINK_NAME]));
+	nla_strlcpy(link_info.str, nla_data(link[TIPC_NLA_LINK_NAME]),
+		    TIPC_MAX_LINK_NAME);
 
 	return tipc_add_tlv(msg->rep, TIPC_TLV_LINK_INFO,
 			    &link_info, sizeof(link_info));
-- 
2.7.4