Added bounds checking on pinMode

arduino · Nov 30, 2019 · 3122511 · 3122511
1 parent c8d6aef
commit 3122511
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/cores/arduino/wiring_digital.c b/cores/arduino/wiring_digital.c
@@ -28,6 +28,9 @@
 
 void pinMode(uint8_t pin, uint8_t mode)
 {
+  //prevent reading beyond end of arrays:
+  if (pin > sizeof(digital_pin_to_port_PGM) / sizeof(digital_pin_to_port_PGM[0])) return;
+
 	uint8_t bit = digitalPinToBitMask(pin);
 	uint8_t port = digitalPinToPort(pin);
 	volatile uint8_t *reg, *out;