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Simple Bounds checking on APIs like pinMode who use the array g_pin_cfg array #95

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Simple Bounds checking on APIs like pinMode who use the array g_pin_cfg array #95

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1 change: 1 addition & 0 deletions cores/arduino/analog.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -799,6 +799,7 @@ void analogWrite(pin_size_t pinNumber, int value)

if(ptr != nullptr) {
//check the pinmux in case it's been modified by a call to pinMode()
if (pinNumber >= (g_pin_cfg_size / sizeof(g_pin_cfg[0]))) return; /* pinNumber > sizeof of pin table */
bool has_peripheral_mux = R_PFS->PORT[g_pin_cfg[pinNumber].pin >> IOPORT_PRV_PORT_OFFSET].PIN[g_pin_cfg[pinNumber].pin & BSP_IO_PRV_8BIT_MASK].PmnPFS & IOPORT_CFG_PERIPHERAL_PIN;
if (!has_peripheral_mux) {
ptr->end();
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3 changes: 3 additions & 0 deletions cores/arduino/digital.cpp
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Original file line number Diff line number Diff line change
@@ -1,6 +1,7 @@
#include "Arduino.h"

void pinMode(pin_size_t pin, const PinMode mode) {
if (pin >= (g_pin_cfg_size / sizeof(g_pin_cfg[0]))) return; /* pinNumber > sizeof of pin table */
switch (mode) {
case INPUT:
case INPUT_PULLDOWN: // TODO: document the INPUT_PULLDOWN is unavailable
Expand All @@ -19,10 +20,12 @@ void pinMode(pin_size_t pin, const PinMode mode) {
}

void digitalWrite(pin_size_t pin, PinStatus val) {
if (pin >= (g_pin_cfg_size / sizeof(g_pin_cfg[0]))) return; /* pinNumber > sizeof of pin table */
R_IOPORT_PinWrite(NULL, g_pin_cfg[pin].pin, val == LOW ? BSP_IO_LEVEL_LOW : BSP_IO_LEVEL_HIGH);
}

PinStatus digitalRead(pin_size_t pin) {
if (pin >= (g_pin_cfg_size / sizeof(g_pin_cfg[0]))) return LOW; /* pinNumber > sizeof of pin table */
bsp_io_level_t ret;
R_IOPORT_PinRead(NULL, g_pin_cfg[pin].pin, &ret);
return (ret == BSP_IO_LEVEL_LOW ? LOW : HIGH);
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