Branch data     Line data    Source code

       1                 :             : // Copyright (c) 2017-2021 The Bitcoin Core developers
       2                 :             : // Distributed under the MIT software license, see the accompanying
       3                 :             : // file COPYING or http://www.opensource.org/licenses/mit-license.php.
       4                 :             : 
       5                 :             : #include <consensus/tx_check.h>
       6                 :             : 
       7                 :             : #include <consensus/amount.h>
       8                 :             : #include <primitives/transaction.h>
       9                 :             : #include <consensus/validation.h>
      10                 :             : 
      11                 :       26595 : bool CheckTransaction(const CTransaction& tx, TxValidationState& state)
      12                 :             : {
      13                 :             :     // Basic checks that don't depend on any context
      14         [ +  + ]:       26595 :     if (tx.vin.empty())
      15   [ +  -  +  - ]:           1 :         return state.Invalid(TxValidationResult::TX_CONSENSUS, "bad-txns-vin-empty");
      16         [ +  + ]:       26594 :     if (tx.vout.empty())
      17   [ +  -  +  - ]:           1 :         return state.Invalid(TxValidationResult::TX_CONSENSUS, "bad-txns-vout-empty");
      18                 :             :     // Size limits (this doesn't take the witness into account, as that hasn't been checked for malleability)
      19         [ +  + ]:       26593 :     if (::GetSerializeSize(TX_NO_WITNESS(tx)) * WITNESS_SCALE_FACTOR > MAX_BLOCK_WEIGHT) {
      20   [ +  -  +  - ]:           1 :         return state.Invalid(TxValidationResult::TX_CONSENSUS, "bad-txns-oversize");
      21                 :             :     }
      22                 :             : 
      23                 :             :     // Check for negative or overflow output values (see CVE-2010-5139)
      24                 :       26592 :     CAmount nValueOut = 0;
      25         [ +  + ]:       78397 :     for (const auto& txout : tx.vout)
      26                 :             :     {
      27         [ +  + ]:       51808 :         if (txout.nValue < 0)
      28   [ +  -  +  - ]:           1 :             return state.Invalid(TxValidationResult::TX_CONSENSUS, "bad-txns-vout-negative");
      29         [ +  + ]:       51807 :         if (txout.nValue > MAX_MONEY)
      30   [ +  -  +  - ]:           1 :             return state.Invalid(TxValidationResult::TX_CONSENSUS, "bad-txns-vout-toolarge");
      31                 :       51806 :         nValueOut += txout.nValue;
      32         [ +  + ]:       51806 :         if (!MoneyRange(nValueOut))
      33   [ +  -  +  - ]:           1 :             return state.Invalid(TxValidationResult::TX_CONSENSUS, "bad-txns-txouttotal-toolarge");
      34                 :             :     }
      35                 :             : 
      36                 :             :     // Check for duplicate inputs (see CVE-2018-17144)
      37                 :             :     // While Consensus::CheckTxInputs does check if all inputs of a tx are available, and UpdateCoins marks all inputs
      38                 :             :     // of a tx as spent, it does not check if the tx has duplicate inputs.
      39                 :             :     // Failure to run this check will result in either a crash or an inflation bug, depending on the implementation of
      40                 :             :     // the underlying coins database.
      41                 :       26589 :     std::set<COutPoint> vInOutPoints;
      42         [ +  + ]:       55040 :     for (const auto& txin : tx.vin) {
      43   [ +  -  +  + ]:       28453 :         if (!vInOutPoints.insert(txin.prevout).second)
      44   [ +  -  +  -  :           2 :             return state.Invalid(TxValidationResult::TX_CONSENSUS, "bad-txns-inputs-duplicate");
                   +  - ]
      45                 :             :     }
      46                 :             : 
      47         [ +  + ]:       26587 :     if (tx.IsCoinBase())
      48                 :             :     {
      49   [ +  +  +  +  :       26761 :         if (tx.vin[0].scriptSig.size() < 2 || tx.vin[0].scriptSig.size() > 100)
             +  +  +  + ]
      50   [ +  -  +  -  :           3 :             return state.Invalid(TxValidationResult::TX_CONSENSUS, "bad-cb-length");
                   +  - ]
      51                 :             :     }
      52                 :             :     else
      53                 :             :     {
      54         [ +  + ]:       10153 :         for (const auto& txin : tx.vin)
      55         [ +  + ]:        6008 :             if (txin.prevout.IsNull())
      56   [ +  -  +  -  :           2 :                 return state.Invalid(TxValidationResult::TX_CONSENSUS, "bad-txns-prevout-null");
                   +  - ]
      57                 :             :     }
      58                 :             : 
      59                 :             :     return true;
      60                 :       26589 : }