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Fix crash in Slot::deletePeer (#5635)

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Fix crash due to recurrent call to `Slot::deletePeer` (via `OverlayImpl::unsquelch`) when a peer is disconnected at just the wrong moment.
This commit is contained in:
Bronek Kozicki
2025-07-31 18:08:34 +01:00
committed by GitHub
parent baf4b8381f
commit d835e97490
2 changed files with 19 additions and 5 deletions
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8
src/xrpld/overlay/Slot.h
View File

@@ -446,6 +446,8 @@ Slot<clock_type>::deletePeer(PublicKey const& validator, id_t id, bool erase)
auto it = peers_.find(id);
if (it != peers_.end())
{
std::vector<Peer::id_t> toUnsquelch;
JLOG(journal_.trace())
<< "deletePeer: " << Slice(validator) << " " << id << " selected "
<< (it->second.state == PeerState::Selected) << " considered "
@@ -457,7 +459,7 @@ Slot<clock_type>::deletePeer(PublicKey const& validator, id_t id, bool erase)
for (auto& [k, v] : peers_)
{
if (v.state == PeerState::Squelched)
handler_.unsquelch(validator, k);
toUnsquelch.push_back(k);
v.state = PeerState::Counting;
v.count = 0;
v.expire = now;
@@ -479,6 +481,10 @@ Slot<clock_type>::deletePeer(PublicKey const& validator, id_t id, bool erase)
if (erase)
peers_.erase(it);
// Must be after peers_.erase(it)
for (auto const& k : toUnsquelch)
handler_.unsquelch(validator, k);
}
}

16
src/xrpld/overlay/detail/OverlayImpl.cpp
View File

@@ -1423,7 +1423,12 @@ OverlayImpl::updateSlotAndSquelch(
if (!strand_.running_in_this_thread())
return post(
strand_,
[this, key, validator, peers = std::move(peers), type]() mutable {
// Must capture copies of reference parameters (i.e. key, validator)
[this,
key = key,
validator = validator,
peers = std::move(peers),
type]() mutable {
updateSlotAndSquelch(key, validator, std::move(peers), type);
});
@@ -1444,9 +1449,12 @@ OverlayImpl::updateSlotAndSquelch(
return;
if (!strand_.running_in_this_thread())
return post(strand_, [this, key, validator, peer, type]() {
updateSlotAndSquelch(key, validator, peer, type);
});
return post(
strand_,
// Must capture copies of reference parameters (i.e. key, validator)
[this, key = key, validator = validator, peer, type]() {
updateSlotAndSquelch(key, validator, peer, type);
});
slots_.updateSlotAndSquelch(key, validator, peer, type, [&]() {
reportInboundTraffic(TrafficCount::squelch_ignored, 0);