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Fix bug #52345: MQTT buffer length check seems wrong
(for empty payload in publish message)
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@ -716,7 +716,7 @@ mqtt_message_received(mqtt_client_t *client, u8_t fixed_hdr_idx, u16_t length, u
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topic = var_hdr_payload + 2;
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after_topic = 2 + topic_len;
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/* Check length, add one byte even for QoS 0 so that zero termination will fit */
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if ((after_topic + (qos ? 2 : 1)) > length) {
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if ((after_topic + (qos ? 2 : 1)) > (MQTT_VAR_HEADER_BUFFER_LEN - fixed_hdr_idx)) {
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LWIP_DEBUGF(MQTT_DEBUG_WARN, ("mqtt_message_received: Receive buffer can not fit topic + pkt_id\n"));
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goto out_disconnect;
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}
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