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Reject headers that build on an invalid parent

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This commit is contained in:
Pieter Wuille 2014-12-11 13:35:14 +01:00
parent 203632d20b
commit 3497022347
1 changed files with 6 additions and 0 deletions
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6
src/main.cpp
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@ -449,6 +449,10 @@ void FindNextBlocksToDownload(NodeId nodeid, unsigned int count, std::vector<CBl
// are not yet downloaded and not in flight to vBlocks. In the mean time, update // are not yet downloaded and not in flight to vBlocks. In the mean time, update
// pindexLastCommonBlock as long as all ancestors are already downloaded. // pindexLastCommonBlock as long as all ancestors are already downloaded.
BOOST_FOREACH(CBlockIndex* pindex, vToFetch) { BOOST_FOREACH(CBlockIndex* pindex, vToFetch) {
if (!pindex->IsValid(BLOCK_VALID_TREE)) {
// We consider the chain that this peer is on invalid.
return;
}
if (pindex->nStatus & BLOCK_HAVE_DATA) { if (pindex->nStatus & BLOCK_HAVE_DATA) {
if (pindex->nChainTx) if (pindex->nChainTx)
state->pindexLastCommonBlock = pindex; state->pindexLastCommonBlock = pindex;
@ -2563,6 +2567,8 @@ bool AcceptBlockHeader(const CBlockHeader& block, CValidationState& state, CBloc
if (mi == mapBlockIndex.end()) if (mi == mapBlockIndex.end())
return state.DoS(10, error("%s : prev block not found", __func__), 0, "bad-prevblk"); return state.DoS(10, error("%s : prev block not found", __func__), 0, "bad-prevblk");
pindexPrev = (*mi).second; pindexPrev = (*mi).second;
if (pindexPrev->nStatus & BLOCK_FAILED_MASK)
return state.DoS(100, error("%s : prev block invalid", __func__), REJECT_INVALID, "bad-prevblk");
} }
if (!ContextualCheckBlockHeader(block, state, pindexPrev)) if (!ContextualCheckBlockHeader(block, state, pindexPrev))