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Remove GetSpendHeight

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It is unclear what the goal of the helper is, as the caller already
knows the spend height before calling the helper.

Also, in case the coins view is corrupted, LookupBlockIndex will return
nullptr. Dereferencing a nullptr is UB.

Fix both issues by removing it. Also, add a sanity check, which aborts
if the coins view is corrupted.
This commit is contained in:
MarcoFalke 2021-11-23 18:03:11 +01:00
parent 26a1147ce5
commit fa3942fc4c
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GPG key ID: CE2B75697E69A548
2 changed files with 4 additions and 16 deletions
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13
src/validation.cpp
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@ -723,6 +723,8 @@ bool MemPoolAccept::PreChecks(ATMPArgs& args, Workspace& ws)
// to coins_to_uncache)
m_view.SetBackend(m_dummy);
assert(m_active_chainstate.m_blockman.LookupBlockIndex(m_view.GetBestBlock()) == m_active_chainstate.m_chain.Tip());
// Only accept BIP68 sequence locked transactions that can be mined in the next
// block; we don't want our mempool filled up with transactions that can't
// be mined yet.
@ -731,7 +733,8 @@ bool MemPoolAccept::PreChecks(ATMPArgs& args, Workspace& ws)
if (!CheckSequenceLocks(m_active_chainstate.m_chain.Tip(), m_view, tx, STANDARD_LOCKTIME_VERIFY_FLAGS, &lp))
return state.Invalid(TxValidationResult::TX_PREMATURE_SPEND, "non-BIP68-final");
if (!Consensus::CheckTxInputs(tx, state, m_view, m_active_chainstate.m_blockman.GetSpendHeight(m_view), ws.m_base_fees)) {
// The mempool holds txs for the next block, so pass height+1 to CheckTxInputs
if (!Consensus::CheckTxInputs(tx, state, m_view, m_active_chainstate.m_chain.Height() + 1, ws.m_base_fees)) {
return false; // state filled in by CheckTxInputs
}
@ -1311,14 +1314,6 @@ bool CScriptCheck::operator()() {
return VerifyScript(scriptSig, m_tx_out.scriptPubKey, witness, nFlags, CachingTransactionSignatureChecker(ptxTo, nIn, m_tx_out.nValue, cacheStore, *txdata), &error);
}
int BlockManager::GetSpendHeight(const CCoinsViewCache& inputs)
{
AssertLockHeld(cs_main);
CBlockIndex* pindexPrev = LookupBlockIndex(inputs.GetBestBlock());
return pindexPrev->nHeight + 1;
}
static CuckooCache::cache<uint256, SignatureCacheHasher> g_scriptExecutionCache;
static CSHA256 g_scriptExecutionCacheHasher;

7
src/validation.h
View file

@ -478,13 +478,6 @@ public:
//! Returns last CBlockIndex* that is a checkpoint
CBlockIndex* GetLastCheckpoint(const CCheckpointData& data) EXCLUSIVE_LOCKS_REQUIRED(cs_main);
/**
* Return the spend height, which is one more than the inputs.GetBestBlock().
* While checking, GetBestBlock() refers to the parent block. (protected by cs_main)
* This is also true for mempool checks.
*/
int GetSpendHeight(const CCoinsViewCache& inputs) EXCLUSIVE_LOCKS_REQUIRED(cs_main);
~BlockManager() {
Unload();
}