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[mqtt] Replace sprintf with snprintf for friendly name hash (#13262)

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This commit is contained in:
J. Nick Koston
2026-01-16 08:30:22 -10:00
committed by GitHub
parent 16adae7359
commit 916b028fb2
1 changed files with 1 additions and 2 deletions
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3
esphome/components/mqtt/mqtt_component.cpp
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@@ -189,8 +189,7 @@ bool MQTTComponent::send_discovery_() {
StringRef object_id = this->get_default_object_id_to_(object_id_buf);
if (discovery_info.unique_id_generator == MQTT_MAC_ADDRESS_UNIQUE_ID_GENERATOR) {
char friendly_name_hash[9];
sprintf(friendly_name_hash, "%08" PRIx32, fnv1_hash(this->friendly_name_()));
friendly_name_hash[8] = 0; // ensure the hash-string ends with null
snprintf(friendly_name_hash, sizeof(friendly_name_hash), "%08" PRIx32, fnv1_hash(this->friendly_name_()));
// Format: mac-component_type-hash (e.g. "aabbccddeeff-sensor-12345678")
// MAC (12) + "-" (1) + domain (max 20) + "-" (1) + hash (8) + null (1) = 43
char unique_id[MAC_ADDRESS_BUFFER_SIZE + ESPHOME_DOMAIN_MAX_LEN + 11];