Author: tuexen
Date: Thu Sep 10 12:01:35 2020
New Revision: 365565
URL: https://svnweb.freebsd.org/changeset/base/365565
Log:
MFC r361081:
Allow only IPv4 addresses in sendto() for TCP on AF_INET sockets.
This problem was found by looking at syzkaller reproducers for some other
problems.
Modified:
stable/12/sys/netinet/tcp_usrreq.c
Directory Properties:
stable/12/ (props changed)
Modified: stable/12/sys/netinet/tcp_usrreq.c
==============================================================================
--- stable/12/sys/netinet/tcp_usrreq.c Thu Sep 10 11:55:45 2020
(r365564)
+++ stable/12/sys/netinet/tcp_usrreq.c Thu Sep 10 12:01:35 2020
(r365565)
@@ -1032,6 +1032,12 @@ tcp_usr_send(struct socket *so, int flags, struct mbuf
error = EINVAL;
goto out;
}
+ if ((inp->inp_vflag & INP_IPV6PROTO) == 0) {
+ if (m != NULL)
+ m_freem(m);
+ error = EAFNOSUPPORT;
+ goto out;
+ }
if (IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr)) {
if (m)
m_freem(m);
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