core: safety check for retrying dns cache find

(cherry picked from commit 9a56b88) (cherry picked from commit 3883a31)
kamailio · Mar 28, 2017 · e20b38e · e20b38e
1 parent fc4cfe9
commit e20b38e
Showing 1 changed file with 4 additions and 2 deletions.
diff --git a/dns_cache.c b/dns_cache.c
@@ -597,8 +597,10 @@ inline static struct dns_hash_entry* _dns_hash_find(str* name, int type,
 			cname_chain++;
 			cname.s=((struct cname_rdata*)e->rr_lst->rdata)->name;
 			cname.len= ((struct cname_rdata*)e->rr_lst->rdata)->name_len;
-			name=&cname;
-			goto again;
+			if(cname.s!=NULL && cname.len>0) {
+				name=&cname;
+				goto again;
+			}
 		}
 	}
 	return ret;