From 806691fa172a1bc0250a34faa3868eb4ecd84dcd Mon Sep 17 00:00:00 2001
From: Steven Gu <asongala@163.com>
Date: Mon, 23 Oct 2023 09:42:07 +0800
Subject: [PATCH] U

---
 common/libzkp/impl/src/utils.rs | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/common/libzkp/impl/src/utils.rs b/common/libzkp/impl/src/utils.rs
index b06589a00c..206dd1ef08 100644
--- a/common/libzkp/impl/src/utils.rs
+++ b/common/libzkp/impl/src/utils.rs
@@ -13,8 +13,14 @@ pub(crate) static OUTPUT_DIR: Lazy<Option<String>> =
 
 /// # Safety
 #[no_mangle]
-pub unsafe extern "C" fn free_c_chars(ptr: *mut c_char) {
-    let _ = CString::from_raw(ptr);
+pub extern "C" fn free_c_chars(ptr: *mut c_char) {
+    log::info!("free_c_chars BEGIN");
+    if !ptr.is_null() {
+        unsafe {
+            let _ = CString::from_raw(ptr);
+        }
+    }
+    log::info!("free_c_chars END");
 }
 
 pub(crate) fn c_char_to_str(c: *const c_char) -> &'static str {