Name constraints with excluded names but no permitted names should allow names not matching the exc…

net/cert/internal/name_constraints.cc

Index: net/cert/internal/name_constraints.cc
diff --git a/net/cert/internal/name_constraints.cc b/net/cert/internal/name_constraints.cc
index 07e231e4d2331c7b15e65e1fc4ff5ddb73cad7db..68455c7bcba10f05fd8fda1e6584edc209fac317 100644
--- a/net/cert/internal/name_constraints.cc
+++ b/net/cert/internal/name_constraints.cc
@@ -505,6 +505,12 @@ bool NameConstraints::IsPermittedDNSName(const std::string& name) const {
     if (DNSNameMatches(name, excluded_name, WILDCARD_PARTIAL_MATCH))
       return false;
   }
+
+  // If permitted subtrees are not constrained, any name that is not excluded is
+  // allowed.
+  if (!(permitted_subtrees_.present_name_types & GENERAL_NAME_DNS_NAME))
+    return true;
+
   for (const std::string& permitted_name : permitted_subtrees_.dns_names) {
     // When matching wildcard hosts against permitted subtrees, consider it a
     // match only if the constraint would match all expansions of the wildcard.
@@ -530,6 +536,12 @@ bool NameConstraints::IsPermittedDirectoryName(
       return false;
     }
   }
+
+  // If permitted subtrees are not constrained, any name that is not excluded is
+  // allowed.
+  if (!(permitted_subtrees_.present_name_types & GENERAL_NAME_DIRECTORY_NAME))
+    return true;
+
   for (const auto& permitted_name : permitted_subtrees_.directory_names) {
     if (VerifyNameInSubtree(
             name_rdn_sequence,
@@ -551,6 +563,12 @@ bool NameConstraints::IsPermittedIP(const IPAddressNumber& ip) const {
     if (IPNumberMatchesPrefix(ip, excluded_ip.first, excluded_ip.second))
       return false;
   }
+
+  // If permitted subtrees are not constrained, any name that is not excluded is
+  // allowed.
+  if (!(permitted_subtrees_.present_name_types & GENERAL_NAME_IP_ADDRESS))
+    return true;
+
   for (const auto& permitted_ip : permitted_subtrees_.ip_address_ranges) {
     if (IPNumberMatchesPrefix(ip, permitted_ip.first, permitted_ip.second))
       return true;