tipc: fix an infoleak in tipc_nl_compat_link_dump

[ Upstream commit 5d2be1422e02ccd697ccfcd45c85b4a26e6178e2 ]

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@gatech.edu>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/tipc/netlink_compat.c b/net/tipc/netlink_compat.c
index 2ed732bfe94b4dc8d1eeae45492b5932484153f9..f4f27c7c54fb51cced68d1fc173aa35fbd6ed305 100644 (file)
--- a/net/tipc/netlink_compat.c
+++ b/net/tipc/netlink_compat.c
@@ -574,7 +574,8 @@ 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));