With this patch IPV6 code ensure that only sockets with the expected sk->sk_prot are converted to IPV4.
Signed-off-by: Boris Pismenny <bor...@mellanox.com> --- net/ipv6/ipv6_sockglue.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/net/ipv6/ipv6_sockglue.c b/net/ipv6/ipv6_sockglue.c index 02d795f..318cd344 100644 --- a/net/ipv6/ipv6_sockglue.c +++ b/net/ipv6/ipv6_sockglue.c @@ -174,6 +174,7 @@ static int do_ipv6_setsockopt(struct sock *sk, int level, int optname, if (val == PF_INET) { struct ipv6_txoptions *opt; struct sk_buff *pktopt; + struct proto *expected_prot; if (sk->sk_type == SOCK_RAW) break; @@ -199,6 +200,17 @@ static int do_ipv6_setsockopt(struct sock *sk, int level, int optname, break; } + if (sk->sk_protocol == IPPROTO_TCP && + sk->sk_prot != &tcpv6_prot) + break; + + expected_prot = &udpv6_prot; + if (sk->sk_protocol == IPPROTO_UDPLITE) + expected_prot = &udplitev6_prot; + + if (sk->sk_prot != expected_prot) + break; + fl6_free_socklist(sk); __ipv6_sock_mc_close(sk); -- 1.8.3.1