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getifaddrs() can return entries where ifa_addr is NULL. Check for this

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before accessing anything in ifa_addr.
ok claudio@
This commit is contained in:
benno 2020-12-30 18:46:55 +00:00
parent 8435d35a4e
commit 44e7c9d580
1 changed files with 2 additions and 1 deletions
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3
usr.sbin/mrouted/cfparse.y
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@ -558,7 +558,8 @@ ifconfaddr(a)
return (NULL);
for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
if (ifa->ifa_addr->sa_family == AF_INET &&
if (ifa->ifa_addr != NULL &&
ifa->ifa_addr->sa_family == AF_INET &&
((struct sockaddr_in *)ifa->ifa_addr)->sin_addr.s_addr == a) {
strlcpy(ifname, ifa->ifa_name, sizeof(ifname));
freeifaddrs(ifap);