From 7f7cbe962324f7af8d55423ee09635996a8c9332 Mon Sep 17 00:00:00 2001
From: guyf2010 <guyf2010@hotmail.com>
Date: Mon, 14 Nov 2022 12:19:44 +0000
Subject: Ensure random colorization always changes byte

---
 src/afl-fuzz-redqueen.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

(limited to 'src')

diff --git a/src/afl-fuzz-redqueen.c b/src/afl-fuzz-redqueen.c
index 3feeaca0..0dae26a3 100644
--- a/src/afl-fuzz-redqueen.c
+++ b/src/afl-fuzz-redqueen.c
@@ -172,7 +172,15 @@ static void random_replace(afl_state_t *afl, u8 *buf, u32 len) {
 
   for (u32 i = 0; i < len; i++) {
 
-    buf[i] = rand_below(afl, 256);
+    u8 c;
+
+    do {
+
+      c = rand_below(afl, 256);
+
+    } while (c == buf[i]);
+
+    buf[i] = c;
 
   }
 
-- 
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