Handle DNS header-only packets as invalid.

diff --git a/lib/rfc1035.c b/lib/rfc1035.c
index 77a4d6ddfecde4d8914b17c8b08c29d8a90f69cc..0552e5cd308d7e2f30f8731999e43236560e52d8 100644 (file)
--- a/lib/rfc1035.c
+++ b/lib/rfc1035.c
@@ -288,6 +288,10 @@ rfc1035NameUnpack(const char *buf, size_t sz, unsigned int *off, unsigned short
     assert(ns > 0);
     do {
        assert((*off) < sz);
+        if ((*off) >= sz) {
+            RFC1035_UNPACK_DEBUG;
+            return 1;
+        }
        c = *(buf + (*off));
        if (c > 191) {
             /* blasted compression */