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Merge pull request #4926

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584a358 Do merkle root and txid duplicates check simultaneously (Pieter Wuille)
This commit is contained in:
Pieter Wuille
2014-10-02 06:05:02 +02:00
parent 471d38b015 584a358997
commit 76c171033c
3 changed files with 57 additions and 17 deletions
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15
src/main.cpp
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@@ -2236,13 +2236,12 @@ bool CheckBlock(const CBlock& block, CValidationState& state, bool fCheckPOW, bo
if (!CheckTransaction(tx, state))
return 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, block.vtx) {
uniqueTx.insert(tx.GetHash());
}
if (uniqueTx.size() != block.vtx.size())
// Check for merkle tree malleability (CVE-2012-2459): repeating sequences
// of transactions in a block without affecting the merkle root of a block,
// while still invalidating it.
bool mutated;
uint256 hashMerkleRoot2 = block.BuildMerkleTree(&mutated);
if (mutated)
return state.DoS(100, error("CheckBlock() : duplicate transaction"),
REJECT_INVALID, "bad-txns-duplicate", true);
@@ -2256,7 +2255,7 @@ bool CheckBlock(const CBlock& block, CValidationState& state, bool fCheckPOW, bo
REJECT_INVALID, "bad-blk-sigops", true);
// Check merkle root
if (fCheckMerkleRoot && block.hashMerkleRoot != block.BuildMerkleTree())
if (fCheckMerkleRoot && block.hashMerkleRoot != hashMerkleRoot2)
return state.DoS(100, error("CheckBlock() : hashMerkleRoot mismatch"),
REJECT_INVALID, "bad-txnmrklroot", true);