Merge #13096: [Policy] Fix MAX_STANDARD_TX_WEIGHT check

2f1a30c Fix MAX_STANDARD_TX_WEIGHT check (Johnson Lau)

Pull request description:

  As suggested by the constant name and its comment in policy.h, a transaction with a weight of exactly MAX_STANDARD_TX_WEIGHT should be allowed. Users could be confused.

Tree-SHA512: af417de1c6a2e6796ebbb39aa0caad8764302ded155cb1bbfbe457e4567c199cc53256189832b17d4aeec369e190b3edd4c6116d5f0b8cf0ede6dfb4ed83bdd3

Author: laanwj

src/net_processing.cpp

@@ -664,10 +664,10 @@ bool AddOrphanTx(const CTransactionRef& tx, NodeId peer) EXCLUSIVE_LOCKS_REQUIRE
     // large transaction with a missing parent then we assume
     // it will rebroadcast it later, after the parent transaction(s)
     // have been mined or received.
-    // 100 orphans, each of which is at most 99,999 bytes big is
+    // 100 orphans, each of which is at most 100,000 bytes big is
     // at most 10 megabytes of orphans and somewhat more byprev index (in the worst case):
     unsigned int sz = GetTransactionWeight(*tx);
-    if (sz >= MAX_STANDARD_TX_WEIGHT)
+    if (sz > MAX_STANDARD_TX_WEIGHT)
     {
         LogPrint(BCLog::MEMPOOL, "ignoring large orphan tx (size: %u, hash: %s)\n", sz, hash.ToString());
         return false;

src/policy/policy.cpp

@@ -88,7 +88,7 @@ bool IsStandardTx(const CTransaction& tx, std::string& reason)
     // computing signature hashes is O(ninputs*txsize). Limiting transactions
     // to MAX_STANDARD_TX_WEIGHT mitigates CPU exhaustion attacks.
     unsigned int sz = GetTransactionWeight(tx);
-    if (sz >= MAX_STANDARD_TX_WEIGHT) {
+    if (sz > MAX_STANDARD_TX_WEIGHT) {
         reason = "tx-size";
         return false;
     }

src/wallet/wallet.cpp

@@ -3078,7 +3078,7 @@ bool CWallet::CreateTransaction(const std::vector<CRecipient>& vecSend, CTransac
         tx = MakeTransactionRef(std::move(txNew));
 
         // Limit size
-        if (GetTransactionWeight(*tx) >= MAX_STANDARD_TX_WEIGHT)
+        if (GetTransactionWeight(*tx) > MAX_STANDARD_TX_WEIGHT)
         {
             strFailReason = _("Transaction too large");
             return false;