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After r338257 is was possible to trigger a KASSERT() in ud6_output()

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using an application trying to use a v4mapped destination address on a
kernel without INET support or on a v6only socket.
Catch this case and prevent the packet from going anywhere;
else, without the KASSERT() armed, a v4mapped destination
address might go out on the wire or other undefined behaviour
might happen, while with the KASSERT() we panic.

PR:		231728
Reported by:	Jeremy Faulkner (gldisater gmail.com)
Approved by:	re (kib)
This commit is contained in:
Bjoern A. Zeeb 2018-10-02 17:29:56 +00:00
parent c6a3ec2b9f
commit 9cffbc68bd
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=339091
1 changed files with 13 additions and 1 deletions
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14
sys/netinet6/udp6_usrreq.c
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@ -784,8 +784,20 @@ udp6_output(struct socket *so, int flags_arg, struct mbuf *m,
return ((*pru->pru_send)(so, flags_arg, m,
(struct sockaddr *)sin6, control, td));
}
}
} else
#endif
if (sin6 && IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)) {
/*
* Given this is either an IPv6-only socket or no INET is
* supported we will fail the send if the given destination
* address is a v4mapped address.
*/
if (unlock_inp == UH_WLOCKED)
INP_WUNLOCK(inp);
else
INP_RUNLOCK(inp);
return (EINVAL);
}
if (control) {
if ((error = ip6_setpktopts(control, &opt,