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HAL_ChibiOS: fixed handling of invalid channel for LED write

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this prevents a null ptr dereference when an invalid channel (such as
one on IOMCU) is used for LEDs
This commit is contained in:
Andrew Tridgell 2021-02-13 09:36:04 +11:00
parent 098a17fe2e
commit 0cc4409845
1 changed files with 2 additions and 2 deletions
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4
libraries/AP_HAL_ChibiOS/RCOutput.cpp
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@ -1979,12 +1979,12 @@ void RCOutput::set_serial_led_rgb_data(const uint16_t chan, int8_t led, uint8_t
uint8_t i = 0; uint8_t i = 0;
pwm_group *grp = find_chan(chan, i); pwm_group *grp = find_chan(chan, i);
WITH_SEMAPHORE(grp->serial_led_mutex);
if (!grp || grp->serial_nleds == 0) { if (!grp || grp->serial_nleds == 0) {
return; return;
} }
WITH_SEMAPHORE(grp->serial_led_mutex);
if (led == -1) { if (led == -1) {
grp->prepared_send = true; grp->prepared_send = true;
for (uint8_t n=0; n<grp->serial_nleds; n++) { for (uint8_t n=0; n<grp->serial_nleds; n++) {