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| author | Pieter Wuille <pieter.wuille@gmail.com> | 2015-03-19 05:34:06 -0700 |
|---|---|---|
| committer | Pieter Wuille <pieter.wuille@gmail.com> | 2015-05-13 12:52:57 -0700 |
| commit | dce8360e44d5330cc9f9d09c9b09ac9237237204 (patch) | |
| tree | adeb8c21937470d6bd326f6a8cf2d9ae5f8904b9 /src/chain.cpp | |
| parent | 23254131a3fdaeae9c50dafca6d0addbbf235820 (diff) | |
Reduce checkpoints' effect on consensus.
Instead of only checking height to decide whether to disable script checks,
actually check whether a block is an ancestor of a checkpoint, up to which
headers have been validated. This means that we don't have to prevent
accepting a side branch anymore - it will be safe, just less fast to
do.
We still need to prevent being fed a multitude of low-difficulty headers
filling up our memory. The mechanism for that is unchanged for now: once
a checkpoint is reached with headers, no headers chain branching off before
that point are allowed anymore.
Diffstat (limited to 'src/chain.cpp')
| -rw-r--r-- | src/chain.cpp | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/src/chain.cpp b/src/chain.cpp index 719256106e..5b8ce076c4 100644 --- a/src/chain.cpp +++ b/src/chain.cpp @@ -82,9 +82,10 @@ CBlockIndex* CBlockIndex::GetAncestor(int height) while (heightWalk > height) { int heightSkip = GetSkipHeight(heightWalk); int heightSkipPrev = GetSkipHeight(heightWalk - 1); - if (heightSkip == height || - (heightSkip > height && !(heightSkipPrev < heightSkip - 2 && - heightSkipPrev >= height))) { + if (pindexWalk->pskip != NULL && + (heightSkip == height || + (heightSkip > height && !(heightSkipPrev < heightSkip - 2 && + heightSkipPrev >= height)))) { // Only follow pskip if pprev->pskip isn't better than pskip->pprev. pindexWalk = pindexWalk->pskip; heightWalk = heightSkip; |