p2p: Avoid an IsAncestorOfBestHeaderOrTip call
What the developer wrote
Authored by Pieter Wuille
p2p: Avoid an IsAncestorOfBestHeaderOrTip call
Just don't call this function when it won't have any effect.
Note that we can't remove the LookupBlockIndex call, since `last_received_header`
is needed to check if new headers were received (`received_new_header`).
What changed, and why it matters
This is a tiny code cleanup in Bitcoin Core's peer-to-peer message handling. It changes how one internal flag is set so that an existing true value is preserved, rather than rechecking a condition that cannot change a false value. There is no security issue visible in the diff.
No security action required. Treat as normal code-quality/refactoring commit.
Security signals we found
No security-relevant behavioral change identified
Change is a logical simplification/optimization with equivalent semantics
No input validation, authorization, memory safety, or cryptographic changes
Evidence from the diff
In PeerManagerImpl::ProcessHeadersMessage, the patch replaces an if-statement that sets already_validated_work = true when IsAncestorOfBestHeaderOrTip(last_received_header) is true with a direct OR assignment: already_validated_work = already_validated_work || IsAncestorOfBestHeaderOrTip(…). This is behaviorally equivalent when already_validated_work is false and avoids a redundant function call when already_validated_work is already true. The commit message explicitly frames this as a no-effect optimization.
Changed components
src/net_processing.cppPeerManagerImpl::ProcessHeadersMessageheaders synchronization logicInspect captured patch +1 / −3
diff --git a/src/net_processing.cpp b/src/net_processing.cpp
index 26107b0a..5c8d92f0 100644
--- a/src/net_processing.cpp
+++ b/src/net_processing.cpp
@@ -2919,9 +2919,7 @@ void PeerManagerImpl::ProcessHeadersMessage(CNode& pfrom, Peer& peer,
{
LOCK(cs_main);
last_received_header = m_chainman.m_blockman.LookupBlockIndex(headers.back().GetHash());
- if (IsAncestorOfBestHeaderOrTip(last_received_header)) {
- already_validated_work = true;
- }
+ already_validated_work = already_validated_work || IsAncestorOfBestHeaderOrTip(last_received_header);
}
// If our peer has NetPermissionFlags::NoBan privileges, then bypass our
Why this scored 14/100
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