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Rover: avoid integer underflow in mavlink txspace check

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This commit is contained in:
Andrew Tridgell 2014-07-27 21:14:32 +10:00
parent a60590d1fe
commit 7810314f7c
1 changed files with 2 additions and 2 deletions
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4
APMrover2/GCS_Mavlink.pde
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@ -10,7 +10,7 @@ static bool in_mavlink_delay;
static bool gcs_out_of_time;
// check if a message will fit in the payload space available
#define CHECK_PAYLOAD_SIZE(id) if (payload_space < MAVLINK_MSG_ID_## id ##_LEN) return false
#define CHECK_PAYLOAD_SIZE(id) if (txspace < MAVLINK_NUM_NON_PAYLOAD_BYTES+MAVLINK_MSG_ID_## id ##_LEN) return false
/*
* !!NOTE!!
@ -377,7 +377,7 @@ static bool telemetry_delayed(mavlink_channel_t chan)
// try to send a message, return false if it won't fit in the serial tx buffer
bool GCS_MAVLINK::try_send_message(enum ap_message id)
{
int16_t payload_space = comm_get_txspace(chan) - MAVLINK_NUM_NON_PAYLOAD_BYTES;
uint16_t txspace = comm_get_txspace(chan);
if (telemetry_delayed(chan)) {
return false;