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| -rw-r--r-- | src/main.cpp | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/src/main.cpp b/src/main.cpp index e5d110d8ef..427e435a90 100644 --- a/src/main.cpp +++ b/src/main.cpp @@ -1652,6 +1652,16 @@ bool CBlock::CheckBlock() const if (!tx.CheckTransaction()) 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; BOOST_FOREACH(const CTransaction& tx, vtx) { |