ipv4/udp: Verify multicast group is ours in upd_v4_early_demux()

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[ Upstream commit 6e54030932 ]

421b3885bf "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>

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Shawn Bohrer 2015-06-03 16:27:38 -05:00 • committed by Greg Kroah-Hartman

parent 67070968a2

commit fa73050507

1 changed files with 15 additions and 3 deletions

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net/ipv4/udp.c

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