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Message type check in readSubscription (#147)

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Added message type checking in readSubscription
https://github.com/adafruit/Adafruit_MQTT_Library/issues/147
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Anton ACE 2019-03-14 17:54:06 +03:00 committed by GitHub
parent 493a1cf590
commit 417d342078
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1 changed files with 3 additions and 0 deletions
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Adafruit_MQTT.cpp
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@ -463,6 +463,9 @@ Adafruit_MQTT_Subscribe *Adafruit_MQTT::readSubscription(int16_t timeout) {
DEBUG_PRINT("Packet len: "); DEBUG_PRINTLN(len); DEBUG_PRINT("Packet len: "); DEBUG_PRINTLN(len);
DEBUG_PRINTBUFFER(buffer, len); DEBUG_PRINTBUFFER(buffer, len);
if (len<3) return NULL;
if ((buffer[0] & 0xF0) != (MQTT_CTRL_PUBLISH) << 4) return NULL;
// Parse out length of packet. // Parse out length of packet.
topiclen = buffer[3]; topiclen = buffer[3];
DEBUG_PRINT(F("Looking for subscription len ")); DEBUG_PRINTLN(topiclen); DEBUG_PRINT(F("Looking for subscription len ")); DEBUG_PRINTLN(topiclen);