From c7d7680cd6b2c325ec8004d6262e1e9089f450fd Mon Sep 17 00:00:00 2001
From: Henry Gabryjelski <henrygab@users.noreply.github.com>
Date: Wed, 13 Mar 2024 23:23:31 -0700
Subject: [PATCH] Decoder must not write more bit than requested

---
 armsrc/em4x70.c | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/armsrc/em4x70.c b/armsrc/em4x70.c
index 5e06a5570..2732c1405 100644
--- a/armsrc/em4x70.c
+++ b/armsrc/em4x70.c
@@ -687,11 +687,15 @@ static int em4x70_receive(uint8_t *bits, size_t length) {
             // pulse length 1.5 -> 2 bits + flip edge detection
             if (edge == FALLING_EDGE) {
                 bits[bit_pos++] = 0;
-                bits[bit_pos++] = 0;
+                if (bit_pos < length) {
+                    bits[bit_pos++] = 0;
+                }
                 edge = RISING_EDGE;
             } else {
                 bits[bit_pos++] = 1;
-                bits[bit_pos++] = 1;
+                if (bit_pos < length) {
+                    bits[bit_pos++] = 1;
+                }
                 edge = FALLING_EDGE;
             }
 
@@ -700,10 +704,14 @@ static int em4x70_receive(uint8_t *bits, size_t length) {
             // pulse length of 2 -> two bits
             if (edge == FALLING_EDGE) {
                 bits[bit_pos++] = 0;
-                bits[bit_pos++] = 1;
+                if (bit_pos < length) {
+                    bits[bit_pos++] = 1;
+                }
             } else {
                 bits[bit_pos++] = 1;
-                bits[bit_pos++] = 0;
+                if (bit_pos < length) {
+                    bits[bit_pos++] = 0;
+                }
             }
 
         } else {