From 10dbb3b42506c964280f5f6d6d43d45ab0a33a02 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ond=C5=99ej=20Hru=C5=A1ka?= <ondra@ondrovo.com>
Date: Sat, 27 Nov 2021 17:05:14 +0100
Subject: [PATCH] add overrun check to SEE

---
 src/fh_see.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/fh_see.c b/src/fh_see.c
index 9e6b474..28639d9 100644
--- a/src/fh_see.c
+++ b/src/fh_see.c
@@ -15,6 +15,12 @@ static void show_word(struct fh_thread_s *fh, const struct fh_word_s *w)
       while (1) {
         // make sure it's aligned
         execptr = WORDALIGNED(execptr);
+        
+        if (execptr == 0 || execptr > fh->here) {
+          LOGE("Exec overrun without ENDWORD!");
+          break;
+        }
+        
         FHPRINT("0x%08x: ", execptr);
         const struct fh_instruction_s *instr = fh_instr_at(fh, execptr);
         if (!instr) {