[TD-4521]<fix>

a87f83bf · yihaoDeng · 096fadd7 · a87f83bf
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src/os/src/detail/osString.c src/os/src/detail/osString.c +3 -0

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--- 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;