RRSIG: reject records with empty SIG section

diff --git a/lib/dns/rdata/generic/rrsig_46.c b/lib/dns/rdata/generic/rrsig_46.c
index 0c63e1e9c4b41061c3a94fb665f4859f9a870514..a247964883be467361f0dfb54780cea3d46df70b 100644 (file)
--- a/lib/dns/rdata/generic/rrsig_46.c
+++ b/lib/dns/rdata/generic/rrsig_46.c
@@ -311,6 +311,9 @@ fromwire_rrsig(ARGS_FROMWIRE) {
         * Sig.
         */
        isc_buffer_activeregion(source, &sr);
+       if (sr.length < 1) {
+               return (DNS_R_FORMERR);
+       }
        isc_buffer_forward(source, sr.length);
        return (mem_tobuffer(target, sr.base, sr.length));
 }