From 15c1c0fb5e25fadb8364534088d8b8c83b9f9675 Mon Sep 17 00:00:00 2001
From: van Hauser <vh@thc.org>
Date: Tue, 17 Jan 2023 11:07:50 +0100
Subject: [PATCH]  Avoid no-op in ByteRandMutator (#999)

---
 libafl/src/mutators/mutations.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/libafl/src/mutators/mutations.rs b/libafl/src/mutators/mutations.rs
index c46f1168bf..33085b1d90 100644
--- a/libafl/src/mutators/mutations.rs
+++ b/libafl/src/mutators/mutations.rs
@@ -311,7 +311,7 @@ where
             Ok(MutationResult::Skipped)
         } else {
             let byte = state.rand_mut().choose(input.bytes_mut());
-            *byte = state.rand_mut().next() as u8;
+            *byte ^= 1 + state.rand_mut().below(254) as u8;
             Ok(MutationResult::Mutated)
         }
     }