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Merge pull request #5253

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7c041b3 Check against MANDATORY flags prior to accepting to mempool (Peter Todd)
This commit is contained in:
Wladimir J. van der Laan 2014-12-22 12:27:40 +01:00
commit 203632d20b
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1 changed files with 15 additions and 0 deletions
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src/main.cpp
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@ -1060,6 +1060,21 @@ bool AcceptToMemoryPool(CTxMemPool& pool, CValidationState &state, const CTransa
{
return error("AcceptToMemoryPool: ConnectInputs failed %s", hash.ToString());
}
// Check again against just the consensus-critical mandatory script
// verification flags, in case of bugs in the standard flags that cause
// transactions to pass as valid when they're actually invalid. For
// instance the STRICTENC flag was incorrectly allowing certain
// CHECKSIG NOT scripts to pass, even though they were invalid.
//
// There is a similar check in CreateNewBlock() to prevent creating
// invalid blocks, however allowing such transactions into the mempool
// can be exploited as a DoS attack.
if (!CheckInputs(tx, state, view, true, MANDATORY_SCRIPT_VERIFY_FLAGS, true))
{
return error("AcceptToMemoryPool: : BUG! PLEASE REPORT THIS! ConnectInputs failed against MANDATORY but not STANDARD flags %s", hash.ToString());
}
// Store transaction in memory
pool.addUnchecked(hash, entry);
}