From 888d88ef6e1806d500ab1293d88f31276638f21a Mon Sep 17 00:00:00 2001
From: mstroh76 <m.stroh76@gmail.com>
Date: Sat, 27 Jan 2024 19:24:43 +0100
Subject: [PATCH] #16

---
 wiringPi/wiringPi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/wiringPi/wiringPi.c b/wiringPi/wiringPi.c
index 25c957c..5fec7c2 100644
--- a/wiringPi/wiringPi.c
+++ b/wiringPi/wiringPi.c
@@ -502,7 +502,7 @@ int GPIOToSysFS(const int pin) {
   }
   if (PI_MODEL_5 == RaspberryPiModel) {
     sysfspin = pin + 399;
-    if (pin>426) {  // only 399-426 supported
+    if (sysfspin<399 || sysfspin>426) {  // only 399-426 supported, 40-pin GPIO header
       sysfspin = -1;
     }
   }