mptcp: add fullmesh flag check for adding address

The fullmesh flag mustn't be used with the signal flag when adding an
address. This patch added the necessary flags check for this case.

Fixes: 73c762c1f07d ("mptcp: set fullmesh flag in pm_netlink")
Signed-off-by: Geliang Tang <geliang.tang@suse.com>
Signed-off-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

diff --git a/net/mptcp/pm_netlink.c b/net/mptcp/pm_netlink.c
index e090810bb35dec55037e30829795cac578294ee2..800515fe5e1dd38f6c788705feb6861e8452bccb 100644 (file)
--- a/net/mptcp/pm_netlink.c
+++ b/net/mptcp/pm_netlink.c
@@ -1264,6 +1264,12 @@ static int mptcp_nl_cmd_add_addr(struct sk_buff *skb, struct genl_info *info)
                return -EINVAL;
        }
 
+       if (addr.flags & MPTCP_PM_ADDR_FLAG_SIGNAL &&
+           addr.flags & MPTCP_PM_ADDR_FLAG_FULLMESH) {
+               GENL_SET_ERR_MSG(info, "flags mustn't have both signal and fullmesh");
+               return -EINVAL;
+       }
+
        if (addr.flags & MPTCP_PM_ADDR_FLAG_IMPLICIT) {
                GENL_SET_ERR_MSG(info, "can't create IMPLICIT endpoint");
                return -EINVAL;