1 files changed, 19 insertions, 1 deletions
diff --git a/src/cryptonote_core/blockchain.cpp b/src/cryptonote_core/blockchain.cpp
index 82691eb6b..c094d1bd9 100644
--- a/src/cryptonote_core/blockchain.cpp
+++ b/src/cryptonote_core/blockchain.cpp
@@ -2322,9 +2322,11 @@ bool Blockchain::check_tx_inputs(transaction& tx, tx_verification_context &tvc,
 
   crypto::hash tx_prefix_hash = get_transaction_prefix_hash(tx);
 
+  const uint8_t hf_version = m_hardfork->get_current_version();
+
   // from hard fork 2, we require mixin at least 2 unless one output cannot mix with 2 others
   // if one output cannot mix with 2 others, we accept at most 1 output that can mix
-  if (m_hardfork->get_current_version() >= 2)
+  if (hf_version >= 2)
   {
     size_t n_unmixable = 0, n_mixable = 0;
     size_t mixin = std::numeric_limits<size_t>::max();
@@ -2371,6 +2373,22 @@ bool Blockchain::check_tx_inputs(transaction& tx, tx_verification_context &tvc,
         return false;
       }
     }
+
+    // min/max tx version based on HF, and we accept v1 txes if having a non mixable
+    const size_t max_tx_version = (hf_version <= 3) ? 1 : 2;
+    if (tx.version > max_tx_version)
+    {
+      LOG_PRINT_L1("transaction version " << (unsigned)tx.version << " is higher than max accepted version " << max_tx_version);
+      tvc.m_verifivation_failed = true;
+      return false;
+    }
+    const size_t min_tx_version = (n_unmixable > 0 ? 1 : (hf_version >= 5) ? 2 : 1);
+    if (tx.version < min_tx_version)
+    {
+      LOG_PRINT_L1("transaction version " << (unsigned)tx.version << " is lower than min accepted version " << min_tx_version);
+      tvc.m_verifivation_failed = true;
+      return false;
+    }
   }
 
   auto it = m_check_txin_table.find(tx_prefix_hash);