From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dmitry Safonov Subject: [PATCH] netlink: Do not subscribe to non-existent groups Date: Fri, 27 Jul 2018 16:54:44 +0100 Message-ID: <20180727155444.17081-1-dima@arista.com> Cc: Dmitry Safonov , "David S. Miller" , Herbert Xu , Steffen Klassert , netdev@vger.kernel.org To: linux-kernel@vger.kernel.org Return-path: Sender: linux-kernel-owner@vger.kernel.org List-Id: netdev.vger.kernel.org Make ABI more strict about subscribing to group > ngroups. Code doesn't check for that and it looks bogus. (one can subscribe to non-existing group) Still, it's possible to bind() to all possible groups with (-1) Cc: "David S. Miller" Cc: Herbert Xu Cc: Steffen Klassert Cc: netdev@vger.kernel.org Signed-off-by: Dmitry Safonov --- net/netlink/af_netlink.c | 1 + 1 file changed, 1 insertion(+) diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c index 393573a99a5a..ac805caed2e2 100644 --- a/net/netlink/af_netlink.c +++ b/net/netlink/af_netlink.c @@ -1008,6 +1008,7 @@ static int netlink_bind(struct socket *sock, struct sockaddr *addr, if (err) return err; } + groups &= (1UL << nlk->ngroups) - 1; bound = nlk->bound; if (bound) { -- 2.13.6