| author | Shawn Bohrer <sbohrer@rgmadvisors.com> | |
| Wed, 3 Jun 2015 21:27:38 +0000 (16:27 -0500) | ||
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | |
| Tue, 23 Jun 2015 00:01:18 +0000 (17:01 -0700) | ||
| commit | fa730505072b85750f21f652783bb595dc22bbd5 | |
| tree | 2f0179b8fbd3f026771c5f0924756ad891fc4b11 | tree | snapshot (tar.xz tar.gz zip) |
| parent | 67070968a28bd501e2ff864bab3e95006cca4e00 | commit | diff |
ipv4/udp: Verify multicast group is ours in upd_v4_early_demux()
[ Upstream commit 6e540309326188f769e03bb4c6dd8ff6752930c2 ]
421b3885bf6d56391297844f43fb7154a6396e12 "udp: ipv4: Add udp early
demux" introduced a regression that allowed sockets bound to INADDR_ANY
to receive packets from multicast groups that the socket had not joined.
For example a socket that had joined 224.168.2.9 could also receive
packets from 225.168.2.9 despite not having joined that group if
ip_early_demux is enabled.
Fix this by calling ip_check_mc_rcu() in udp_v4_early_demux() to verify
that the multicast packet is indeed ours.
Signed-off-by: Shawn Bohrer <sbohrer@rgmadvisors.com>
Reported-by: Yurij M. Plotnikov <Yurij.Plotnikov@oktetlabs.ru>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
[ Upstream commit 6e540309326188f769e03bb4c6dd8ff6752930c2 ]
421b3885bf6d56391297844f43fb7154a6396e12 "udp: ipv4: Add udp early
demux" introduced a regression that allowed sockets bound to INADDR_ANY
to receive packets from multicast groups that the socket had not joined.
For example a socket that had joined 224.168.2.9 could also receive
packets from 225.168.2.9 despite not having joined that group if
ip_early_demux is enabled.
Fix this by calling ip_check_mc_rcu() in udp_v4_early_demux() to verify
that the multicast packet is indeed ours.
Signed-off-by: Shawn Bohrer <sbohrer@rgmadvisors.com>
Reported-by: Yurij M. Plotnikov <Yurij.Plotnikov@oktetlabs.ru>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| net/ipv4/udp.c | diff | blob | history |