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-rw-r--r--src/net_processing.cpp17
1 files changed, 15 insertions, 2 deletions
diff --git a/src/net_processing.cpp b/src/net_processing.cpp
index f83a20102e..50ac76924b 100644
--- a/src/net_processing.cpp
+++ b/src/net_processing.cpp
@@ -2187,7 +2187,16 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
mapBlockSource.emplace(pblock->GetHash(), std::make_pair(pfrom->GetId(), false));
}
bool fNewBlock = false;
- ProcessNewBlock(chainparams, pblock, true, &fNewBlock);
+ // Setting fForceProcessing to true means that we bypass some of
+ // our anti-DoS protections in AcceptBlock, which filters
+ // unrequested blocks that might be trying to waste our resources
+ // (eg disk space). Because we only try to reconstruct blocks when
+ // we're close to caught up (via the CanDirectFetch() requirement
+ // above, combined with the behavior of not requesting blocks until
+ // we have a chain with at least nMinimumChainWork), and we ignore
+ // compact blocks with less work than our tip, it is safe to treat
+ // reconstructed compact blocks as having been requested.
+ ProcessNewBlock(chainparams, pblock, /*fForceProcessing=*/true, &fNewBlock);
if (fNewBlock) {
pfrom->nLastBlockTime = GetTime();
} else {
@@ -2267,7 +2276,11 @@ bool static ProcessMessage(CNode* pfrom, const std::string& strCommand, CDataStr
bool fNewBlock = false;
// Since we requested this block (it was in mapBlocksInFlight), force it to be processed,
// even if it would not be a candidate for new tip (missing previous block, chain not long enough, etc)
- ProcessNewBlock(chainparams, pblock, true, &fNewBlock);
+ // This bypasses some anti-DoS logic in AcceptBlock (eg to prevent
+ // disk-space attacks), but this should be safe due to the
+ // protections in the compact block handler -- see related comment
+ // in compact block optimistic reconstruction handling.
+ ProcessNewBlock(chainparams, pblock, /*fForceProcessing=*/true, &fNewBlock);
if (fNewBlock) {
pfrom->nLastBlockTime = GetTime();
} else {