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AP_RCProtocol: fixed bug in FPort parser

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if we got invalid frame->type values we would overrun the buffer and
cause memory corruption. This was the cause of the bug Polarijet found
This commit is contained in:
Andrew Tridgell 2020-03-20 09:44:13 +11:00
parent 30baad35b2
commit a1069d85cb
1 changed files with 7 additions and 0 deletions
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7
libraries/AP_RCProtocol/AP_RCProtocol_FPort.cpp
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@ -322,6 +322,10 @@ void AP_RCProtocol_FPort::_process_byte(uint32_t timestamp_us, uint8_t b)
(frame->type == FPORT_TYPE_DOWNLINK && frame->len != FRAME_LEN_DOWNLINK)) {
goto reset;
}
if (frame->type != FPORT_TYPE_CONTROL && frame->type != FPORT_TYPE_DOWNLINK) {
// invalid type
goto reset;
}
}
if (frame->type == FPORT_TYPE_CONTROL && byte_input.ofs == FRAME_LEN_CONTROL + 4) {
@ -335,6 +339,9 @@ void AP_RCProtocol_FPort::_process_byte(uint32_t timestamp_us, uint8_t b)
}
goto reset;
}
if (byte_input.ofs == sizeof(byte_input.buf)) {
goto reset;
}
return;
reset: