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ESP8266: add an error check for data overflow from modem side #9366

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Jan 18, 2019
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ESP8266: add an error check for data overflow from modem side #9366

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4 changes: 4 additions & 0 deletions components/wifi/esp8266-driver/ESP8266/ESP8266.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -715,6 +715,10 @@ int32_t ESP8266::_recv_tcp_passive(int id, void *data, uint32_t amount, uint32_t

// update internal variable tcp_data_avbl to reflect the remaining data
if (_sock_i[id].tcp_data_rcvd > 0) {
if (_sock_i[id].tcp_data_rcvd > (int32_t)amount) {
MBED_ERROR(MBED_MAKE_ERROR(MBED_MODULE_DRIVER, MBED_ERROR_CODE_EBADMSG), \
"ESP8266::_recv_tcp_passive() too much data from modem\n");
}
if (_sock_i[id].tcp_data_avbl > _sock_i[id].tcp_data_rcvd) {
_sock_i[id].tcp_data_avbl -= _sock_i[id].tcp_data_rcvd;
} else {
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