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Check earlier for blocks with duplicate transactions. Fixes #1167

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This commit is contained in:
Gavin Andresen 2012-04-29 20:56:55 -04:00
parent ec4997d48f
commit be8651dde7
1 changed files with 10 additions and 0 deletions
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10
src/main.cpp
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@ -1652,6 +1652,16 @@ bool CBlock::CheckBlock() const
if (!tx.CheckTransaction()) if (!tx.CheckTransaction())
return DoS(tx.nDoS, error("CheckBlock() : CheckTransaction failed")); return DoS(tx.nDoS, error("CheckBlock() : CheckTransaction failed"));
// Check for duplicate txids. This is caught by ConnectInputs(),
// but catching it earlier avoids a potential DoS attack:
set<uint256> uniqueTx;
BOOST_FOREACH(const CTransaction& tx, vtx)
{
uniqueTx.insert(tx.GetHash());
}
if (uniqueTx.size() != vtx.size())
return DoS(100, error("CheckBlock() : duplicate transaction"));
unsigned int nSigOps = 0; unsigned int nSigOps = 0;
BOOST_FOREACH(const CTransaction& tx, vtx) BOOST_FOREACH(const CTransaction& tx, vtx)
{ {