Commit e1c4e14b authored by Paolo Abeni's avatar Paolo Abeni Committed by Greg Kroah-Hartman

ipv6/udp: use sticky pktinfo egress ifindex on connect()

[ Upstream commit 1cdda918 ]

Currently, the egress interface index specified via IPV6_PKTINFO
is ignored by __ip6_datagram_connect(), so that RFC 3542 section 6.7
can be subverted when the user space application calls connect()
before sendmsg().
Fix it by initializing properly flowi6_oif in connect() before
performing the route lookup.
Signed-off-by: default avatarPaolo Abeni <pabeni@redhat.com>
Acked-by: default avatarHannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent e8e729cc
......@@ -162,6 +162,9 @@ static int __ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int a
fl6.fl6_dport = inet->inet_dport;
fl6.fl6_sport = inet->inet_sport;
if (!fl6.flowi6_oif)
fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex;
if (!fl6.flowi6_oif && (addr_type&IPV6_ADDR_MULTICAST))
fl6.flowi6_oif = np->mcast_oif;
......
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