serial: nrfx_uarte: check size before writing to buffer

NRFX UARTE would write to user supplied buffer on IRQ without checking whether or not the supplied buffer had available space left to write one char Signed-off-by: Arne Edholm <[email protected]>
zephyrproject-rtos · May 6, 2021 · 2b864ed · 2b864ed
1 parent a71a8db
commit 2b864ed
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/drivers/serial/uart_nrfx_uarte.c b/drivers/serial/uart_nrfx_uarte.c
@@ -1452,7 +1452,7 @@ static int uarte_nrfx_fifo_read(const struct device *dev,
  NRF_UARTE_Type *uarte = get_uarte_instance(dev);
  const struct uarte_nrfx_data *data = get_dev_data(dev);
 
- if (nrf_uarte_event_check(uarte, NRF_UARTE_EVENT_ENDRX)) {
+ if (size > 0 && nrf_uarte_event_check(uarte, NRF_UARTE_EVENT_ENDRX)) {
  /* Clear the interrupt */
  nrf_uarte_event_clear(uarte, NRF_UARTE_EVENT_ENDRX);