Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 3.18 07/32] ipv6: Inhibit IPv4-mapped src address on the wire. | Date | Mon, 19 Jun 2017 23:20:51 +0800 |
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3.18-stable review patch. If anyone has any objections, please let me know.
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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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