From a87f83bff081b964d0cb89a88dca9e0f95b727ac Mon Sep 17 00:00:00 2001
From: yihaoDeng <yhdeng@taosdata.com>
Date: Tue, 8 Jun 2021 15:34:36 +0800
Subject: [PATCH] [TD-4521]<fix>

---
 src/os/src/detail/osString.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/os/src/detail/osString.c b/src/os/src/detail/osString.c
index 2c49797d83..fdc70b667e 100644
--- a/src/os/src/detail/osString.c
+++ b/src/os/src/detail/osString.c
@@ -59,6 +59,9 @@ bool taosMbsToUcs4(char *mbs, size_t mbsLength, char *ucs4, int32_t ucs4_max_len
   iconv_close(cd);
   if (len != NULL) {
     *len = (int32_t)(ucs4_max_len - outLeft);
+    if (*len < 0) {
+      return false;
+    }
   }
 
   return true;
-- 
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