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Avoid a NULL pointer derefence introduced in rev. 1.129.

Browse Source 
Problem noticed by:	bde, gcc(1)
Panic caught by:	mjacob
Patch tested by:	mjacob
This commit is contained in:
Ruslan Ermilov 2001-07-23 16:50:01 +00:00
parent 7d3c25f718
commit 38c1bc358b
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=80211
1 changed files with 21 additions and 24 deletions
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45
sys/netinet/ip_output.c
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@ -253,14 +253,14 @@ ip_output(m0, opt, ro, flags, imo)
ip->ip_ttl = 1;
isbroadcast = in_broadcast(dst->sin_addr, ifp);
} else if (IN_MULTICAST(ntohl(ip->ip_dst.s_addr)) &&
(imo != NULL) &&
(imo->imo_multicast_ifp != NULL)) {
imo != NULL && imo->imo_multicast_ifp != NULL) {
/*
* bypass the normal routing lookup for
* multicast packets if the interface is
* specified
* Bypass the normal routing lookup for multicast
* packets if the interface is specified.
*/
/* No Operation */
ifp = imo->imo_multicast_ifp;
IFP_TO_IA(ifp, ia);
isbroadcast = 0; /* fool gcc */
} else {
/*
* If this is the case, we probably don't want to allocate
@ -303,8 +303,6 @@ ip_output(m0, opt, ro, flags, imo)
*/
if (imo != NULL) {
ip->ip_ttl = imo->imo_multicast_ttl;
if (imo->imo_multicast_ifp != NULL)
ifp = imo->imo_multicast_ifp;
if (imo->imo_multicast_vif != -1)
ip->ip_src.s_addr =
ip_mcast_src(imo->imo_multicast_vif);
@ -325,13 +323,9 @@ ip_output(m0, opt, ro, flags, imo)
* of outgoing interface.
*/
if (ip->ip_src.s_addr == INADDR_ANY) {
register struct in_ifaddr *ia1;
TAILQ_FOREACH(ia1, &in_ifaddrhead, ia_link)
if (ia1->ia_ifp == ifp) {
ip->ip_src = IA_SIN(ia1)->sin_addr;
break;
}
/* Interface may have no addresses. */
if (ia != NULL)
ip->ip_src = IA_SIN(ia)->sin_addr;
}
IN_LOOKUP_MULTI(ip->ip_dst, ifp, inm);
@ -394,15 +388,18 @@ ip_output(m0, opt, ro, flags, imo)
* of outgoing interface.
*/
if (ip->ip_src.s_addr == INADDR_ANY) {
ip->ip_src = IA_SIN(ia)->sin_addr;
/* Interface may have no addresses. */
if (ia != NULL) {
ip->ip_src = IA_SIN(ia)->sin_addr;
#ifdef IPFIREWALL_FORWARD
/* Keep note that we did this - if the firewall changes
* the next-hop, our interface may change, changing the
* default source IP. It's a shame so much effort happens
* twice. Oh well.
*/
fwd_rewrite_src++;
/* Keep note that we did this - if the firewall changes
* the next-hop, our interface may change, changing the
* default source IP. It's a shame so much effort happens
* twice. Oh well.
*/
fwd_rewrite_src++;
#endif /* IPFIREWALL_FORWARD */
}
}
#endif /* notdef */
/*
@ -824,7 +821,7 @@ ip_output(m0, opt, ro, flags, imo)
}
/* Record statistics for this interface address. */
if (!(flags & IP_FORWARDING)) {
if (!(flags & IP_FORWARDING) && ia) {
ia->ia_ifa.if_opackets++;
ia->ia_ifa.if_obytes += m->m_pkthdr.len;
}
@ -964,7 +961,7 @@ ip_output(m0, opt, ro, flags, imo)
/* clean ipsec history once it goes out of the node */
ipsec_delaux(m);
#endif
if (error == 0) {
if (error == 0 && ia) {
/* Record statistics for this interface address. */
ia->ia_ifa.if_opackets++;
ia->ia_ifa.if_obytes += m->m_pkthdr.len;