diff options
| author | Dmitry Safonov <dima@arista.com> | 2018-07-27 16:54:44 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-08-03 07:50:45 +0200 |
| commit | e208cda5f10e131f149e59d7de4ceb943382f4c6 (patch) | |
| tree | 42d3ec5eb3bb1043a6271133d6fce8752e306539 | |
| parent | da970765b24cad557bde1b0372166e46c1276230 (diff) | |
netlink: Do not subscribe to non-existent groups
[ Upstream commit 7acf9d4237c46894e0fa0492dd96314a41742e84 ]
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" <davem@davemloft.net>
Cc: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Steffen Klassert <steffen.klassert@secunet.com>
Cc: netdev@vger.kernel.org
Signed-off-by: Dmitry Safonov <dima@arista.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | net/netlink/af_netlink.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/net/netlink/af_netlink.c b/net/netlink/af_netlink.c index b3932846f6c46..143d9001e87d2 100644 --- a/net/netlink/af_netlink.c +++ b/net/netlink/af_netlink.c @@ -976,6 +976,7 @@ static int netlink_bind(struct socket *sock, struct sockaddr *addr, if (err) return err; } + groups &= (1UL << nlk->ngroups) - 1; bound = nlk->bound; if (bound) { |