Accept unrequested blocks with work equal to our tip

This is a simple change that makes our accept requirements the
same as our request requirements, (ever so slightly) further
decoupling our consensus logic from our FindNextBlocksToDownload
logic in net_processing.

Github-Pull: #11531
Rebased-From: 932f118e6a3779bb3d6c3cc83963cf34ac150e42

1 files changed, 4 insertions, 4 deletions

diff --git a/src/validation.cpp b/src/validation.cpp
index c52f8bf70b..c641cae7e9 100644
--- a/src/validation.cpp
+++ b/src/validation.cpp
@@ -3102,7 +3102,7 @@ static bool AcceptBlock(const std::shared_ptr<const CBlock>& pblock, CValidation
     // process an unrequested block if it's new and has enough work to
     // advance our tip, and isn't too many blocks ahead.
     bool fAlreadyHave = pindex->nStatus & BLOCK_HAVE_DATA;
-    bool fHasMoreWork = (chainActive.Tip() ? pindex->nChainWork > chainActive.Tip()->nChainWork : true);
+    bool fHasMoreOrSameWork = (chainActive.Tip() ? pindex->nChainWork >= chainActive.Tip()->nChainWork : true);
     // Blocks that are too out-of-order needlessly limit the effectiveness of
     // pruning, because pruning will not delete block files that contain any
     // blocks which are too close in height to the tip.  Apply this test
@@ -3119,9 +3119,9 @@ static bool AcceptBlock(const std::shared_ptr<const CBlock>& pblock, CValidation
     // and unrequested blocks.
     if (fAlreadyHave) return true;
     if (!fRequested) {  // If we didn't ask for it:
-        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
+        if (pindex->nTx != 0) return true;    // This is a previously-processed block that was pruned
+        if (!fHasMoreOrSameWork) 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