Handle over-sized (in virtual bytes) packages with no in-mempool ance…

…stors

src/txmempool.cpp

@@ -201,6 +201,23 @@ bool CTxMemPool::CheckPackageLimits(const Package& package,
                                     const Limits& limits,
                                     std::string &errString) const
 {
+    size_t pack_size = package.size();
+
+    // Package itself is busting mempool limits; should be rejected even if no staged_ancestors exist
+    if (pack_size > static_cast<uint64_t>(limits.ancestor_count)) {
+        errString = strprintf("package count %u exceeds ancestor count limit [limit: %u]", pack_size, limits.ancestor_count);
+        return false;
+    } else if (pack_size > static_cast<uint64_t>(limits.descendant_count)) {
+        errString = strprintf("package count %u exceeds descendant count limit [limit: %u]", pack_size, limits.descendant_count);
+        return false;
+    } else if (total_vsize > limits.ancestor_size_vbytes) {
+        errString = strprintf("package size %u exceeds ancestor size limit [limit: %u]", total_vsize, limits.ancestor_size_vbytes);
+        return false;
+    } else if (total_vsize > limits.descendant_size_vbytes) {
+        errString = strprintf("package size %u exceeds descendant size limit [limit: %u]", total_vsize, limits.descendant_size_vbytes);
+        return false;
+    }
+
     CTxMemPoolEntry::Parents staged_ancestors;
     for (const auto& tx : package) {
         for (const auto& input : tx->vin) {