Fix invalid memory access bug in `afl_custom_pre_save` of example.c

1 files changed, 9 insertions, 7 deletions

diff --git a/examples/custom_mutators/example.c b/examples/custom_mutators/example.c
index a9764f5b..7d827029 100644
--- a/examples/custom_mutators/example.c
+++ b/examples/custom_mutators/example.c
@@ -157,15 +157,17 @@ size_t afl_custom_pre_save(my_mutator_t *data, uint8_t *buf, size_t buf_size,
 
   }
 
-  *out_buf = data->pre_save_buf;
+  uint8_t *pre_save_buf = data->pre_save_buf;
 
-  memcpy(*out_buf + 5, buf, buf_size);
+  memcpy(pre_save_buf + 5, buf, buf_size);
   size_t out_buf_size = buf_size + 5;
-  *out_buf[0] = 'A';
-  *out_buf[1] = 'F';
-  *out_buf[2] = 'L';
-  *out_buf[3] = '+';
-  *out_buf[4] = '+';
+  pre_save_buf[0] = 'A';
+  pre_save_buf[1] = 'F';
+  pre_save_buf[2] = 'L';
+  pre_save_buf[3] = '+';
+  pre_save_buf[4] = '+';
+
+  *out_buf = pre_save_buf;
 
   return out_buf_size;