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Null-check pool.allocZeroed() at 13 sites across 9 files #10262

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a96a99b
Null-check clientNotificationPool / packetPool / mqtt pool allocations
nightjoker7 Apr 23, 2026
bb899f4
Merge branch 'develop' into fix/client-notification-null-checks
thebentern Apr 23, 2026
1d1713a
Merge remote-tracking branch 'origin/develop' into fix/client-notific…
nightjoker7 Apr 23, 2026
055bf7b
Address review feedback on #10262
nightjoker7 Apr 23, 2026
293cf2c
Address Copilot follow-ups: map-report throttle + dedupe proxy WARNs …
nightjoker7 Apr 24, 2026
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15 changes: 10 additions & 5 deletions src/main.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -908,12 +908,17 @@ void setup()
// warn the user about a low entropy key
if (nodeDB->keyIsLowEntropy && !nodeDB->hasWarned) {
LOG_WARN(LOW_ENTROPY_WARNING);
meshtastic_ClientNotification *cn = clientNotificationPool.allocZeroed();
cn->level = meshtastic_LogRecord_Level_WARNING;
cn->time = getValidTime(RTCQualityFromNet);
sprintf(cn->message, LOW_ENTROPY_WARNING);
service->sendClientNotification(cn);
// Mark as warned unconditionally — the LOG_WARN above has already fired the user-visible
// notice. `hasWarned` persists in NodeDB, so this also suppresses the same warning on
// subsequent boots regardless of whether the ClientNotification pool had room this time.
nodeDB->hasWarned = true;
meshtastic_ClientNotification *cn = clientNotificationPool.allocZeroed();
if (cn) {
cn->level = meshtastic_LogRecord_Level_WARNING;
cn->time = getValidTime(RTCQualityFromNet);
sprintf(cn->message, LOW_ENTROPY_WARNING);
service->sendClientNotification(cn);
}
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}
#endif
#if !MESHTASTIC_EXCLUDE_INPUTBROKER
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12 changes: 8 additions & 4 deletions src/mesh/NodeDB.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1881,10 +1881,14 @@ bool NodeDB::updateUser(uint32_t nodeId, meshtastic_User &p, uint8_t channelInde
"to regenerate your public keys.";
LOG_WARN(warning, p.long_name);
meshtastic_ClientNotification *cn = clientNotificationPool.allocZeroed();
cn->level = meshtastic_LogRecord_Level_WARNING;
cn->time = getValidTime(RTCQualityFromNet);
sprintf(cn->message, warning, p.long_name);
service->sendClientNotification(cn);
if (cn) {
cn->level = meshtastic_LogRecord_Level_WARNING;
cn->time = getValidTime(RTCQualityFromNet);
// snprintf because p.long_name is remote-controlled up to 40 bytes and the
// warning format itself is ~150 bytes — sprintf could overflow cn->message.
snprintf(cn->message, sizeof(cn->message), warning, p.long_name);
service->sendClientNotification(cn);
}
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}
return false;
}
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7 changes: 5 additions & 2 deletions src/mesh/PhoneAPI.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -770,11 +770,14 @@ bool PhoneAPI::available()
void PhoneAPI::sendNotification(meshtastic_LogRecord_Level level, uint32_t replyId, const char *message)
{
meshtastic_ClientNotification *cn = clientNotificationPool.allocZeroed();
if (!cn)
return;
cn->has_reply_id = true;
cn->reply_id = replyId;
cn->level = meshtastic_LogRecord_Level_WARNING;
cn->level = level;
cn->time = getValidTime(RTCQualityFromNet);
strncpy(cn->message, message, sizeof(cn->message));
strncpy(cn->message, message, sizeof(cn->message) - 1);
cn->message[sizeof(cn->message) - 1] = '\0';
service->sendClientNotification(cn);
}

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14 changes: 8 additions & 6 deletions src/mesh/Router.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -325,12 +325,14 @@ ErrorCode Router::send(meshtastic_MeshPacket *p)
LOG_WARN("Duty cycle limit exceeded. Aborting send for now, you can send again in %d mins", silentMinutes);

meshtastic_ClientNotification *cn = clientNotificationPool.allocZeroed();
cn->has_reply_id = true;
cn->reply_id = p->id;
cn->level = meshtastic_LogRecord_Level_WARNING;
cn->time = getValidTime(RTCQualityFromNet);
sprintf(cn->message, "Duty cycle limit exceeded. You can send again in %d mins", silentMinutes);
service->sendClientNotification(cn);
if (cn) {
cn->has_reply_id = true;
cn->reply_id = p->id;
cn->level = meshtastic_LogRecord_Level_WARNING;
cn->time = getValidTime(RTCQualityFromNet);
sprintf(cn->message, "Duty cycle limit exceeded. You can send again in %d mins", silentMinutes);
service->sendClientNotification(cn);
}

meshtastic_Routing_Error err = meshtastic_Routing_Error_DUTY_CYCLE_LIMIT;
if (isFromUs(p)) { // only send NAK to API, not to the mesh
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14 changes: 8 additions & 6 deletions src/modules/PositionModule.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -397,12 +397,14 @@ void PositionModule::sendOurPosition(NodeNum dest, bool wantReplies, uint8_t cha
meshtastic_Config_DeviceConfig_Role_TAK_TRACKER) &&
config.power.is_power_saving) {
meshtastic_ClientNotification *notification = clientNotificationPool.allocZeroed();
notification->level = meshtastic_LogRecord_Level_INFO;
notification->time = getValidTime(RTCQualityFromNet);
sprintf(notification->message, "Sending position and sleeping for %us interval in a moment",
Default::getConfiguredOrDefaultMs(config.position.position_broadcast_secs, default_broadcast_interval_secs) /
1000U);
service->sendClientNotification(notification);
if (notification) {
notification->level = meshtastic_LogRecord_Level_INFO;
notification->time = getValidTime(RTCQualityFromNet);
sprintf(notification->message, "Sending position and sleeping for %us interval in a moment",
Default::getConfiguredOrDefaultMs(config.position.position_broadcast_secs, default_broadcast_interval_secs) /
1000U);
service->sendClientNotification(notification);
}
sleepOnNextExecution = true;
LOG_DEBUG("Start next execution in 5s, then sleep");
setIntervalFromNow(FIVE_SECONDS_MS);
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10 changes: 6 additions & 4 deletions src/modules/SerialModule.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -96,10 +96,12 @@ bool SerialModule::isValidConfig(const meshtastic_ModuleConfig_SerialConfig &con
LOG_ERROR(warning);
#if !IS_RUNNING_TESTS
meshtastic_ClientNotification *cn = clientNotificationPool.allocZeroed();
cn->level = meshtastic_LogRecord_Level_ERROR;
cn->time = getValidTime(RTCQualityFromNet);
snprintf(cn->message, sizeof(cn->message), "%s", warning);
service->sendClientNotification(cn);
if (cn) {
cn->level = meshtastic_LogRecord_Level_ERROR;
cn->time = getValidTime(RTCQualityFromNet);
snprintf(cn->message, sizeof(cn->message), "%s", warning);
service->sendClientNotification(cn);
}
#endif
return false;
}
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32 changes: 18 additions & 14 deletions src/modules/Telemetry/AirQualityTelemetry.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -416,27 +416,31 @@ bool AirQualityTelemetryModule::sendTelemetry(NodeNum dest, bool phoneOnly)

if (config.device.role == meshtastic_Config_DeviceConfig_Role_SENSOR && config.power.is_power_saving) {
meshtastic_ClientNotification *notification = clientNotificationPool.allocZeroed();
notification->level = meshtastic_LogRecord_Level_INFO;
notification->time = getValidTime(RTCQualityFromNet);
sprintf(notification->message, "Sending telemetry and sleeping for %us interval in a moment",
Default::getConfiguredOrDefaultMs(moduleConfig.telemetry.air_quality_interval,
default_telemetry_broadcast_interval_secs) /
1000U);
service->sendClientNotification(notification);
if (notification) {
notification->level = meshtastic_LogRecord_Level_INFO;
notification->time = getValidTime(RTCQualityFromNet);
sprintf(notification->message, "Sending telemetry and sleeping for %us interval in a moment",
Default::getConfiguredOrDefaultMs(moduleConfig.telemetry.air_quality_interval,
default_telemetry_broadcast_interval_secs) /
1000U);
service->sendClientNotification(notification);
}
sleepOnNextExecution = true;
LOG_DEBUG("Start next execution in 5s, then sleep");
setIntervalFromNow(FIVE_SECONDS_MS);
}

if (config.device.role == meshtastic_Config_DeviceConfig_Role_SENSOR && config.power.is_power_saving) {
meshtastic_ClientNotification *notification = clientNotificationPool.allocZeroed();
notification->level = meshtastic_LogRecord_Level_INFO;
notification->time = getValidTime(RTCQualityFromNet);
sprintf(notification->message, "Sending telemetry and sleeping for %us interval in a moment",
Default::getConfiguredOrDefaultMs(moduleConfig.telemetry.air_quality_interval,
default_telemetry_broadcast_interval_secs) /
1000U);
service->sendClientNotification(notification);
if (notification) {
notification->level = meshtastic_LogRecord_Level_INFO;
notification->time = getValidTime(RTCQualityFromNet);
sprintf(notification->message, "Sending telemetry and sleeping for %us interval in a moment",
Default::getConfiguredOrDefaultMs(moduleConfig.telemetry.air_quality_interval,
default_telemetry_broadcast_interval_secs) /
1000U);
service->sendClientNotification(notification);
}
sleepOnNextExecution = true;
LOG_DEBUG("Start next execution in 5s, then sleep");
setIntervalFromNow(FIVE_SECONDS_MS);
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16 changes: 9 additions & 7 deletions src/modules/Telemetry/EnvironmentTelemetry.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -644,13 +644,15 @@ bool EnvironmentTelemetryModule::sendTelemetry(NodeNum dest, bool phoneOnly)

if (config.device.role == meshtastic_Config_DeviceConfig_Role_SENSOR && config.power.is_power_saving) {
meshtastic_ClientNotification *notification = clientNotificationPool.allocZeroed();
notification->level = meshtastic_LogRecord_Level_INFO;
notification->time = getValidTime(RTCQualityFromNet);
sprintf(notification->message, "Sending telemetry and sleeping for %us interval in a moment",
Default::getConfiguredOrDefaultMs(moduleConfig.telemetry.environment_update_interval,
default_telemetry_broadcast_interval_secs) /
1000U);
service->sendClientNotification(notification);
if (notification) {
notification->level = meshtastic_LogRecord_Level_INFO;
notification->time = getValidTime(RTCQualityFromNet);
sprintf(notification->message, "Sending telemetry and sleeping for %us interval in a moment",
Default::getConfiguredOrDefaultMs(moduleConfig.telemetry.environment_update_interval,
default_telemetry_broadcast_interval_secs) /
1000U);
service->sendClientNotification(notification);
}
sleepOnNextExecution = true;
LOG_DEBUG("Start next execution in 5s, then sleep");
setIntervalFromNow(FIVE_SECONDS_MS);
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41 changes: 31 additions & 10 deletions src/mqtt/MQTT.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -482,6 +482,10 @@ bool MQTT::publish(const char *topic, const char *payload, bool retained)
{
if (moduleConfig.mqtt.proxy_to_client_enabled) {
meshtastic_MqttClientProxyMessage *msg = mqttClientProxyMessagePool.allocZeroed();
if (!msg) {
// MemoryPool::alloc already LOG_WARNs on exhaustion; don't double-log here.
return false;
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}
msg->which_payload_variant = meshtastic_MqttClientProxyMessage_text_tag;
strncpy(msg->topic, topic, sizeof(msg->topic));
msg->topic[sizeof(msg->topic) - 1] = '\0';
Expand All @@ -503,6 +507,10 @@ bool MQTT::publish(const char *topic, const uint8_t *payload, size_t length, boo
{
if (moduleConfig.mqtt.proxy_to_client_enabled) {
meshtastic_MqttClientProxyMessage *msg = mqttClientProxyMessagePool.allocZeroed();
if (!msg) {
// MemoryPool::alloc already LOG_WARNs on exhaustion; don't double-log here.
return false;
}
Comment on lines +510 to +513
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Copilot AI Apr 23, 2026

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allocZeroed()/MemoryPool already emits warnings when the pool is exhausted, so this additional LOG_WARN can double/triple-log and flood output when publishes are frequent. Prefer relying on the allocator log, lowering severity, or adding throttling.

Copilot uses AI. Check for mistakes.
msg->which_payload_variant = meshtastic_MqttClientProxyMessage_data_tag;
strncpy(msg->topic, topic, sizeof(msg->topic));
msg->topic[sizeof(msg->topic) - 1] = '\0'; // Ensure null termination
Expand Down Expand Up @@ -685,11 +693,13 @@ bool MQTT::isValidConfig(const meshtastic_ModuleConfig_MQTTConfig &config, MQTTC
LOG_ERROR(warning);
#if !IS_RUNNING_TESTS
meshtastic_ClientNotification *cn = clientNotificationPool.allocZeroed();
cn->level = meshtastic_LogRecord_Level_ERROR;
cn->time = getValidTime(RTCQualityFromNet);
strncpy(cn->message, warning, sizeof(cn->message) - 1);
cn->message[sizeof(cn->message) - 1] = '\0'; // Ensure null termination
service->sendClientNotification(cn);
if (cn) {
cn->level = meshtastic_LogRecord_Level_ERROR;
cn->time = getValidTime(RTCQualityFromNet);
strncpy(cn->message, warning, sizeof(cn->message) - 1);
cn->message[sizeof(cn->message) - 1] = '\0'; // Ensure null termination
service->sendClientNotification(cn);
}
#endif
return false;
#endif
Expand All @@ -701,11 +711,13 @@ bool MQTT::isValidConfig(const meshtastic_ModuleConfig_MQTTConfig &config, MQTTC
LOG_ERROR(warning);
#if !IS_RUNNING_TESTS
meshtastic_ClientNotification *cn = clientNotificationPool.allocZeroed();
cn->level = meshtastic_LogRecord_Level_ERROR;
cn->time = getValidTime(RTCQualityFromNet);
strncpy(cn->message, warning, sizeof(cn->message) - 1);
cn->message[sizeof(cn->message) - 1] = '\0'; // Ensure null termination
service->sendClientNotification(cn);
if (cn) {
cn->level = meshtastic_LogRecord_Level_ERROR;
cn->time = getValidTime(RTCQualityFromNet);
strncpy(cn->message, warning, sizeof(cn->message) - 1);
cn->message[sizeof(cn->message) - 1] = '\0'; // Ensure null termination
service->sendClientNotification(cn);
}
#endif
return false;
}
Expand Down Expand Up @@ -878,6 +890,15 @@ void MQTT::perhapsReportToMap()

// Allocate MeshPacket and fill it
meshtastic_MeshPacket *mp = packetPool.allocZeroed();
if (!mp) {
// Back off to the configured publish interval on pool exhaustion. Without this,
// perhapsReportToMap() would be called on every runOnce() (20–200 ms) until the
// pool recovers, and each call would retry the log + early return — turning
// sustained pool pressure into a log-flood instead of a throttled failure.
LOG_ERROR("MQTT Map report: packet pool exhausted");
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Copilot AI Apr 23, 2026

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On packetPool exhaustion this returns immediately without updating last_report_to_map, so perhapsReportToMap() will attempt again on every runOnce() iteration (20–200ms) and can spam logs while the pool remains exhausted. Consider throttling this error path (e.g., set last_report_to_map or a separate last_map_report_alloc_fail timestamp) so failures back off to the configured publish interval.

Suggested change
LOG_ERROR("MQTT Map report: packet pool exhausted");
LOG_ERROR("MQTT Map report: packet pool exhausted");
last_report_to_map = millis();

Copilot uses AI. Check for mistakes.
last_report_to_map = millis();
return;
}
mp->which_payload_variant = meshtastic_MeshPacket_decoded_tag;
mp->from = nodeDB->getNodeNum();
mp->to = NODENUM_BROADCAST;
Expand Down