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 <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

diff --git a/net/tipc/netlink_compat.c b/net/tipc/netlink_compat.c
index f795b1dd0ccdf3dc088e16e1e9ad3ae9cc978d16..3ad9fab1985f1cdca35c876f0f228d28b9b5db00 100644 (file)
--- 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));