tipc: fix nl compat regression for link statistics

Fix incorrect use of nla_strlcpy() where the first NLA_HDRLEN bytes
of the link name where left out.

Making the output of tipc-config -ls look something like:
Link statistics:
dcast-link
1:data0-1.1.2:data0
1:data0-1.1.3:data0

Also, for the record, the patch that introduce this regression
claims "Sending the whole object out can cause a leak". Which isn't
very likely as this is a compat layer, where the data we are parsing
is generated by us and we know the string to be NULL terminated. But
you can of course never be to secure.

Fixes: 5d2be1422e02 (tipc: fix an infoleak in tipc_nl_compat_link_dump)
Signed-off-by: Richard Alpe <richard.alpe@ericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/net/tipc/netlink_compat.c b/net/tipc/netlink_compat.c
index 3ad9fab1985f1cdca35c876f0f228d28b9b5db00..1fd4647647650b75f17f41d19d288be7abe436a3 100644 (file)
--- a/net/tipc/netlink_compat.c
+++ b/net/tipc/netlink_compat.c
@@ -604,7 +604,7 @@ 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]));
-       nla_strlcpy(link_info.str, nla_data(link[TIPC_NLA_LINK_NAME]),
+       nla_strlcpy(link_info.str, link[TIPC_NLA_LINK_NAME],
                    TIPC_MAX_LINK_NAME);
 
        return tipc_add_tlv(msg->rep, TIPC_TLV_LINK_INFO,