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Fix packet pool leak when rx queue is full

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PacketQueue::add() silently dropped packets when the queue was at
capacity. The packet pointer was lost — never enqueued, never returned
to the unused pool. Each occurrence permanently shrank the 32-packet
pool until allocNew() returned NULL and the node went deaf. Return bool
from add() and free the packet back to the pool on failure.
This commit is contained in:
Wessel Nieboer
2026-02-17 23:54:33 +01:00
parent bbc5f0c11a
commit ffc9815e9a
2 changed files with 12 additions and 6 deletions
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16
src/helpers/StaticPoolPacketManager.cpp
View File

@@ -55,15 +55,15 @@ mesh::Packet* PacketQueue::removeByIdx(int i) {
return item;
}
void PacketQueue::add(mesh::Packet* packet, uint8_t priority, uint32_t scheduled_for) {
bool PacketQueue::add(mesh::Packet* packet, uint8_t priority, uint32_t scheduled_for) {
if (_num == _size) {
// TODO: log "FATAL: queue is full!"
return;
return false;
}
_table[_num] = packet;
_pri_table[_num] = priority;
_schedule_table[_num] = scheduled_for;
_num++;
return true;
}
StaticPoolPacketManager::StaticPoolPacketManager(int pool_size): unused(pool_size), send_queue(pool_size), rx_queue(pool_size) {
@@ -82,7 +82,10 @@ void StaticPoolPacketManager::free(mesh::Packet* packet) {
}
void StaticPoolPacketManager::queueOutbound(mesh::Packet* packet, uint8_t priority, uint32_t scheduled_for) {
send_queue.add(packet, priority, scheduled_for);
if (!send_queue.add(packet, priority, scheduled_for)) {
MESH_DEBUG_PRINTLN("queueOutbound: send queue full, dropping packet");
free(packet);
}
}
mesh::Packet* StaticPoolPacketManager::getNextOutbound(uint32_t now) {
@@ -106,7 +109,10 @@ mesh::Packet* StaticPoolPacketManager::removeOutboundByIdx(int i) {
}
void StaticPoolPacketManager::queueInbound(mesh::Packet* packet, uint32_t scheduled_for) {
rx_queue.add(packet, 0, scheduled_for);
if (!rx_queue.add(packet, 0, scheduled_for)) {
MESH_DEBUG_PRINTLN("queueInbound: rx queue full, dropping packet");
free(packet);
}
}
mesh::Packet* StaticPoolPacketManager::getNextInbound(uint32_t now) {
return rx_queue.get(now);

2
src/helpers/StaticPoolPacketManager.h
View File

@@ -11,7 +11,7 @@ class PacketQueue {
public:
PacketQueue(int max_entries);
mesh::Packet* get(uint32_t now);
void add(mesh::Packet* packet, uint8_t priority, uint32_t scheduled_for);
bool add(mesh::Packet* packet, uint8_t priority, uint32_t scheduled_for);
int count() const { return _num; }
int countBefore(uint32_t now) const;
mesh::Packet* itemAt(int i) const { return _table[i]; }