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-rw-r--r--src/validation.cpp6
1 files changed, 6 insertions, 0 deletions
diff --git a/src/validation.cpp b/src/validation.cpp
index d19521bd3c..866e0c9fba 100644
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -3135,6 +3135,12 @@ static bool AcceptBlock(const std::shared_ptr<const CBlock>& pblock, CValidation
if (pindex->nTx != 0) return true; // This is a previously-processed block that was pruned
if (!fHasMoreWork) return true; // Don't process less-work chains
if (fTooFarAhead) return true; // Block height is too high
+
+ // Protect against DoS attacks from low-work chains.
+ // If our tip is behind, a peer could try to send us
+ // low-work blocks on a fake chain that we would never
+ // request; don't process these.
+ if (pindex->nChainWork < nMinimumChainWork) return true;
}
if (fNewBlock) *fNewBlock = true;