Description: correctly limit lookups to the same address family
Author: Claus Assmann

--- sendmail-8.14.4~/sendmail/conf.c.8144	Tue Sep 10 09:46:16 2013
+++ sendmail-8.14.4/sendmail/conf.c	Tue Sep 10 09:46:53 2013
@@ -4231,7 +4231,18 @@
 	h = gethostbyname(name);
 	if (!resv6)
 		_res.options &= ~RES_USE_INET6;
-	*err = h_errno;
+
+	/* the function is supposed to return only the requested family */
+	if (h != NULL && h->h_addrtype != family)
+	{
+# if NETINET6
+		freehostent(h);
+# endif /* NETINET6 */
+		h = NULL;
+		*err = NO_DATA;
+	}
+	else
+		*err = h_errno;
 	return h;
 }
 
@@ -4355,6 +4366,17 @@
 		}
 	}
 #endif /* (SOLARIS > 10000 && SOLARIS < 20400) || (defined(SOLARIS) && SOLARIS < 204) || (defined(sony_news) && defined(__svr4)) */
+
+	/* the function is supposed to return only the requested family */
+	if (h != NULL && h->h_addrtype != family)
+	{
+# if NETINET6
+		freehostent(h);
+# endif /* NETINET6 */
+		h = NULL;
+		SM_SET_H_ERRNO(NO_DATA);
+	}
+
 	if (tTd(61, 10))
 	{
 		if (h == NULL)
@@ -4364,13 +4386,12 @@
 			sm_dprintf("%s\n", h->h_name);
 			if (tTd(61, 11))
 			{
+				struct in_addr ia;
+				size_t i;
 #if NETINET6
 				struct in6_addr ia6;
 				char buf6[INET6_ADDRSTRLEN];
-#else /* NETINET6 */
-				struct in_addr ia;
 #endif /* NETINET6 */
-				size_t i;
 
 				if (h->h_aliases != NULL)
 					for (i = 0; h->h_aliases[i] != NULL;
@@ -4381,16 +4402,23 @@
 				{
 					char *addr;
 
+					addr = NULL;
 #if NETINET6
-					memmove(&ia6, h->h_addr_list[i],
-						IN6ADDRSZ);
-					addr = anynet_ntop(&ia6,
-							   buf6, sizeof(buf6));
-#else /* NETINET6 */
-					memmove(&ia, h->h_addr_list[i],
-						INADDRSZ);
-					addr = (char *) inet_ntoa(ia);
+					if (h->h_addrtype == AF_INET6)
+					{
+						memmove(&ia6, h->h_addr_list[i],
+							IN6ADDRSZ);
+						addr = anynet_ntop(&ia6,
+							buf6, sizeof(buf6));
+					}
+					else
 #endif /* NETINET6 */
+					/* "else" in #if code above */
+					{
+						memmove(&ia, h->h_addr_list[i],
+							INADDRSZ);
+						addr = (char *) inet_ntoa(ia);
+					}
 					if (addr != NULL)
 						sm_dprintf("\taddr: %s\n", addr);
 				}