[PATCH 3.18 07/32] ipv6: Inhibit IPv4-mapped src address on the wire.

From	Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Newsgroups	linux.kernel
Subject	[PATCH 3.18 07/32] ipv6: Inhibit IPv4-mapped src address on the wire.
Date	2017-06-19 17:40 +0200
Message-ID	<tU6Wy-4tx-113@gated-at.bofh.it> (permalink)
References	<tU6Wt-4tx-5@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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3.18-stable review patch.  If anyone has any objections, please let me know.

------------------

From: "Jonathan T. Leighton" <jtleight@udel.edu>


[ Upstream commit ec5e3b0a1d41fbda0cc33a45bc9e54e91d9d12c7 ]

This patch adds a check for the problematic case of an IPv4-mapped IPv6
source address and a destination address that is neither an IPv4-mapped
IPv6 address nor in6addr_any, and returns an appropriate error. The
check in done before returning from looking up the route.

Signed-off-by: Jonathan T. Leighton <jtleight@udel.edu>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 net/ipv6/ip6_output.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -960,6 +960,9 @@ static int ip6_dst_lookup_tail(struct so
 		}
 	}
 #endif
+	if (ipv6_addr_v4mapped(&fl6->saddr) &&
+	    !(ipv6_addr_v4mapped(&fl6->daddr) || ipv6_addr_any(&fl6->daddr)))
+		return -EAFNOSUPPORT;
 
 	return 0;

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[PATCH 3.18 07/32] ipv6: Inhibit IPv4-mapped src address on the wire. Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-06-19 17:40 +0200

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