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validation: Check chain tip is non-null in CheckFinalTx

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...also update comments to remove mention of ::ChainActive()

From: https://github.com/bitcoin/bitcoin/pull/20750#discussion_r579400663

> Also, what about passing a const reference instead of a pointer? I
> know this is only theoretical, but previously if the tip was nullptr,
> then Height() evaluated to -1, now it evaluates to UB
This commit is contained in:
Carl Dong 2021-02-22 11:46:21 -05:00
parent 7fca189a2a
commit 9da106be4d
1 changed files with 3 additions and 2 deletions
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5
src/validation.cpp
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@ -211,6 +211,7 @@ static FlatFileSeq UndoFileSeq();
bool CheckFinalTx(const CBlockIndex* active_chain_tip, const CTransaction &tx, int flags)
{
AssertLockHeld(cs_main);
assert(active_chain_tip); // TODO: Make active_chain_tip a reference
assert(std::addressof(*::ChainActive().Tip()) == std::addressof(*active_chain_tip));
// By convention a negative value for flags indicates that the
@ -221,12 +222,12 @@ bool CheckFinalTx(const CBlockIndex* active_chain_tip, const CTransaction &tx, i
// scheduled, so no flags are set.
flags = std::max(flags, 0);
// CheckFinalTx() uses ::ChainActive().Height()+1 to evaluate
// CheckFinalTx() uses active_chain_tip.Height()+1 to evaluate
// nLockTime because when IsFinalTx() is called within
// CBlock::AcceptBlock(), the height of the block *being*
// evaluated is what is used. Thus if we want to know if a
// transaction can be part of the *next* block, we need to call
// IsFinalTx() with one more than ::ChainActive().Height().
// IsFinalTx() with one more than active_chain_tip.Height().
const int nBlockHeight = active_chain_tip->nHeight + 1;
// BIP113 requires that time-locked transactions have nLockTime set to