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FollowMe: avoid integer underflow in mavlink txspace check

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This commit is contained in:
Andrew Tridgell 2014-07-27 21:14:47 +10:00
parent b36e4b4122
commit b82457eaa6
1 changed files with 2 additions and 2 deletions
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4
FollowMe/simplegcs.cpp
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@ -65,8 +65,8 @@ void simplegcs_send_heartbeat(mavlink_channel_t chan) {
bool simplegcs_try_send_statustext(mavlink_channel_t chan, const char *text, int len) {
int payload_space = comm_get_txspace(chan) - MAVLINK_NUM_NON_PAYLOAD_BYTES;
if (payload_space < MAVLINK_MSG_ID_STATUSTEXT_LEN) return false;
uint16_t txspace = comm_get_txspace(chan);
if (payload_space < MAVLINK_MSG_ID_STATUSTEXT_LEN+MAVLINK_NUM_NON_PAYLOAD_BYTES) return false;
char statustext[50] = { 0 };
if (len < 50) {