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sctp: do not allow the v4 socket to bind a v4mapped v6 address
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The check in sctp_sockaddr_af is not robust enough to forbid binding a
v4mapped v6 addr on a v4 socket.

The worse thing is that v4 socket's bind_verify would not convert this
v4mapped v6 addr to a v4 addr. syzbot even reported a crash as the v4
socket bound a v6 addr.

This patch is to fix it by doing the common sa.sa_family check first,
then AF_INET check for v4mapped v6 addrs.

Fixes: 7dab83d ("sctp: Support ipv6only AF_INET6 sockets.")
Reported-by: syzbot+7b7b518b1228d2743963@syzkaller.appspotmail.com
Acked-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: Xin Long <lucien.xin@gmail.com>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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Xin Long authored and David S. Miller committed Jan 16, 2018
1 parent a0ff660 commit c5006b8
Showing 1 changed file with 6 additions and 8 deletions.
14 changes: 6 additions & 8 deletions net/sctp/socket.c
Original file line number Diff line number Diff line change
Expand Up @@ -335,16 +335,14 @@ static struct sctp_af *sctp_sockaddr_af(struct sctp_sock *opt,
if (len < sizeof (struct sockaddr))
return NULL;

if (!opt->pf->af_supported(addr->sa.sa_family, opt))
return NULL;

/* V4 mapped address are really of AF_INET family */
if (addr->sa.sa_family == AF_INET6 &&
ipv6_addr_v4mapped(&addr->v6.sin6_addr)) {
if (!opt->pf->af_supported(AF_INET, opt))
return NULL;
} else {
/* Does this PF support this AF? */
if (!opt->pf->af_supported(addr->sa.sa_family, opt))
return NULL;
}
ipv6_addr_v4mapped(&addr->v6.sin6_addr) &&
!opt->pf->af_supported(AF_INET, opt))
return NULL;

/* If we get this far, af is valid. */
af = sctp_get_af_specific(addr->sa.sa_family);
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