1 files changed, 2 insertions, 0 deletions
diff --git a/src/regenc.c b/src/regenc.c
index 6376565..9fab721 100644
--- a/src/regenc.c
+++ b/src/regenc.c
@@ -853,6 +853,8 @@ onigenc_mbn_is_mbc_ambiguous(OnigEncoding enc, OnigCaseFoldType flag,
 extern int
 onigenc_mb2_code_to_mbclen(OnigCodePoint code)
 {
+  if ((code & (~0xffff)) != 0) return ONIGERR_INVALID_CODE_POINT_VALUE;
+
   if ((code & 0xff00) != 0) return 2;
   else return 1;
 }