From: John Haxby john.haxby@oracle.com
[ Upstream commit 82c9ae440857840c56e05d4fb1427ee032531346 ]
Commit b6f6118901d1 ("ipv6: restrict IPV6_ADDRFORM operation") fixed a problem found by syzbot an unfortunate logic error meant that it also broke IPV6_ADDRFORM.
Rearrange the checks so that the earlier test is just one of the series of checks made before moving the socket from IPv6 to IPv4.
Fixes: b6f6118901d1 ("ipv6: restrict IPV6_ADDRFORM operation") Signed-off-by: John Haxby john.haxby@oracle.com Cc: stable@vger.kernel.org Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- net/ipv6/ipv6_sockglue.c | 13 ++++++------- 1 file changed, 6 insertions(+), 7 deletions(-)
--- a/net/ipv6/ipv6_sockglue.c +++ b/net/ipv6/ipv6_sockglue.c @@ -183,15 +183,14 @@ static int do_ipv6_setsockopt(struct soc retv = -EBUSY; break; } - } else if (sk->sk_protocol == IPPROTO_TCP) { - if (sk->sk_prot != &tcpv6_prot) { - retv = -EBUSY; - break; - } - break; - } else { + } + if (sk->sk_protocol == IPPROTO_TCP && + sk->sk_prot != &tcpv6_prot) { + retv = -EBUSY; break; } + if (sk->sk_protocol != IPPROTO_TCP) + break; if (sk->sk_state != TCP_ESTABLISHED) { retv = -ENOTCONN; break;