ext/mbstring/oniguruma/src/config.h.win32 |  1 +
 ext/mbstring/oniguruma/src/config.h.win64 |  1 +
 ext/mbstring/oniguruma/src/regcomp.c      | 10 +++++-----
 ext/mbstring/oniguruma/src/regparse.c     |  7 ++++++-
 ext/mbstring/oniguruma/src/regparse.h     | 12 ++++++++++++
 ext/mbstring/oniguruma/src/utf16_be.c     |  4 +++-
 ext/mbstring/oniguruma/src/utf16_le.c     |  3 ++-
 ext/mbstring/oniguruma/src/utf32_be.c     |  1 +
 ext/mbstring/oniguruma/src/utf32_le.c     |  1 +
 9 files changed, 32 insertions(+), 8 deletions(-)

diff --git a/ext/mbstring/oniguruma/src/config.h.win32 b/ext/mbstring/oniguruma/src/config.h.win32
index 12609dfc9d..3c855588fa 100644
--- a/ext/mbstring/oniguruma/src/config.h.win32
+++ b/ext/mbstring/oniguruma/src/config.h.win32
@@ -15,6 +15,7 @@
 #define SIZEOF_VOIDP 4
 #define SIZEOF_FLOAT 4
 #define SIZEOF_DOUBLE 8
+#define SIZEOF_SIZE_T 4
 #define HAVE_PROTOTYPES 1
 #define TOKEN_PASTE(x,y) x##y
 #define HAVE_STDARG_PROTOTYPES 1
diff --git a/ext/mbstring/oniguruma/src/config.h.win64 b/ext/mbstring/oniguruma/src/config.h.win64
index e8920860aa..c8b8c2b8b6 100644
--- a/ext/mbstring/oniguruma/src/config.h.win64
+++ b/ext/mbstring/oniguruma/src/config.h.win64
@@ -15,6 +15,7 @@
 #define SIZEOF_VOIDP 8
 #define SIZEOF_FLOAT 4
 #define SIZEOF_DOUBLE 8
+#define SIZEOF_SIZE_T 8
 #define HAVE_PROTOTYPES 1
 #define TOKEN_PASTE(x,y) x##y
 #define HAVE_STDARG_PROTOTYPES 1
diff --git a/ext/mbstring/oniguruma/src/regcomp.c b/ext/mbstring/oniguruma/src/regcomp.c
index 83b92525d9..3ea28412a7 100644
--- a/ext/mbstring/oniguruma/src/regcomp.c
+++ b/ext/mbstring/oniguruma/src/regcomp.c
@@ -540,13 +540,13 @@ compile_length_string_node(Node* node, regex_t* reg)
   ambig = NODE_STRING_IS_AMBIG(node);
 
   p = prev = sn->s;
-  prev_len = enclen(enc, p);
+  SAFE_ENC_LEN(enc, p, sn->end, prev_len);
   p += prev_len;
   slen = 1;
   rlen = 0;
 
   for (; p < sn->end; ) {
-    len = enclen(enc, p);
+    SAFE_ENC_LEN(enc, p, sn->end, len);
     if (len == prev_len) {
       slen++;
     }
@@ -591,12 +591,12 @@ compile_string_node(Node* node, regex_t* reg)
   ambig = NODE_STRING_IS_AMBIG(node);
 
   p = prev = sn->s;
-  prev_len = enclen(enc, p);
+  SAFE_ENC_LEN(enc, p, end, prev_len);
   p += prev_len;
   slen = 1;
 
   for (; p < end; ) {
-    len = enclen(enc, p);
+    SAFE_ENC_LEN(enc, p, end, len);
     if (len == prev_len) {
       slen++;
     }
@@ -3624,7 +3624,7 @@ expand_case_fold_string(Node* node, regex_t* reg)
       goto err;
     }
 
-    len = enclen(reg->enc, p);
+	SAFE_ENC_LEN(reg->enc, p, end, len);
 
     if (n == 0) {
       if (IS_NULL(snode)) {
diff --git a/ext/mbstring/oniguruma/src/regparse.c b/ext/mbstring/oniguruma/src/regparse.c
index fcc05cf79e..ac5774bb2b 100644
--- a/ext/mbstring/oniguruma/src/regparse.c
+++ b/ext/mbstring/oniguruma/src/regparse.c
@@ -393,14 +393,17 @@ save_entry(ScanEnv* env, enum SaveType type, int* id)
   c = ONIGENC_MBC_TO_CODE(enc, p, end); \
   pfetch_prev = p; \
   p += ONIGENC_MBC_ENC_LEN(enc, p); \
+  if(UNEXPECTED(p > end)) p = end; \
 } while (0)
 
 #define PINC_S     do { \
   p += ONIGENC_MBC_ENC_LEN(enc, p); \
+  if(UNEXPECTED(p > end)) p = end; \
 } while (0)
 #define PFETCH_S(c) do { \
   c = ONIGENC_MBC_TO_CODE(enc, p, end); \
   p += ONIGENC_MBC_ENC_LEN(enc, p); \
+  if(UNEXPECTED(p > end)) p = end; \
 } while (0)
 
 #define PPEEK        (p < end ? ONIGENC_MBC_TO_CODE(enc, p, end) : PEND_VALUE)
@@ -5409,7 +5412,9 @@ fetch_token(OnigToken* tok, UChar** src, UChar* end, ScanEnv* env)
           tok->u.code = c2;
         }
         else { /* string */
-          p = tok->backp + enclen(enc, tok->backp);
+          int len;
+          SAFE_ENC_LEN(enc, tok->backp, end, len);
+          p = tok->backp + len;
         }
       }
       break;
diff --git a/ext/mbstring/oniguruma/src/regparse.h b/ext/mbstring/oniguruma/src/regparse.h
index ff24eeb7d3..2855616d82 100644
--- a/ext/mbstring/oniguruma/src/regparse.h
+++ b/ext/mbstring/oniguruma/src/regparse.h
@@ -455,4 +455,16 @@ extern int onig_global_callout_names_free(void);
 extern int onig_print_names(FILE*, regex_t*);
 #endif
 
+#if (defined (__GNUC__) && __GNUC__ > 2 ) && !defined(DARWIN) && !defined(__hpux) && !defined(_AIX)
+# define UNEXPECTED(condition) __builtin_expect(condition, 0)
+#else
+# define UNEXPECTED(condition) (condition)
+#endif
+
+#define SAFE_ENC_LEN(enc, p, end, res) do {  \
+    int __res = enclen(enc, p);              \
+    if (UNEXPECTED(p + __res > end)) __res = end - p;    \
+	res = __res;                             \
+} while(0);
+
 #endif /* REGPARSE_H */
diff --git a/ext/mbstring/oniguruma/src/utf16_be.c b/ext/mbstring/oniguruma/src/utf16_be.c
index 8f5b8bf64b..0fd298d2b4 100644
--- a/ext/mbstring/oniguruma/src/utf16_be.c
+++ b/ext/mbstring/oniguruma/src/utf16_be.c
@@ -128,16 +128,18 @@ utf16be_is_mbc_newline(const UChar* p, const UChar* end)
 }
 
 static OnigCodePoint
-utf16be_mbc_to_code(const UChar* p, const UChar* end ARG_UNUSED)
+utf16be_mbc_to_code(const UChar* p, const UChar* end)
 {
   OnigCodePoint code;
 
   if (UTF16_IS_SURROGATE_FIRST(*p)) {
+    if (end - p < 4) return 0;
     code = ((((p[0] - 0xd8) << 2) + ((p[1] & 0xc0) >> 6) + 1) << 16)
          + ((((p[1] & 0x3f) << 2) + (p[2] - 0xdc)) << 8)
          + p[3];
   }
   else {
+    if (end - p < 2) return 0;
     code = p[0] * 256 + p[1];
   }
   return code;
diff --git a/ext/mbstring/oniguruma/src/utf16_le.c b/ext/mbstring/oniguruma/src/utf16_le.c
index 92bf3186f5..47cacffdaf 100644
--- a/ext/mbstring/oniguruma/src/utf16_le.c
+++ b/ext/mbstring/oniguruma/src/utf16_le.c
@@ -141,13 +141,14 @@ utf16le_is_mbc_newline(const UChar* p, const UChar* end)
 }
 
 static OnigCodePoint
-utf16le_mbc_to_code(const UChar* p, const UChar* end ARG_UNUSED)
+utf16le_mbc_to_code(const UChar* p, const UChar* end)
 {
   OnigCodePoint code;
   UChar c0 = *p;
   UChar c1 = *(p+1);
 
   if (UTF16_IS_SURROGATE_FIRST(c1)) {
+    if (end - p < 4) return 0;
     code = ((((c1 - 0xd8) << 2) + ((c0  & 0xc0) >> 6) + 1) << 16)
          + ((((c0 & 0x3f) << 2) + (p[3] - 0xdc)) << 8)
          + p[2];
diff --git a/ext/mbstring/oniguruma/src/utf32_be.c b/ext/mbstring/oniguruma/src/utf32_be.c
index 92476ec033..db353afc50 100644
--- a/ext/mbstring/oniguruma/src/utf32_be.c
+++ b/ext/mbstring/oniguruma/src/utf32_be.c
@@ -67,6 +67,7 @@ utf32be_is_mbc_newline(const UChar* p, const UChar* end)
 static OnigCodePoint
 utf32be_mbc_to_code(const UChar* p, const UChar* end ARG_UNUSED)
 {
+  if (end - p < 4) return 0;
   return (OnigCodePoint )(((p[0] * 256 + p[1]) * 256 + p[2]) * 256 + p[3]);
 }
 
diff --git a/ext/mbstring/oniguruma/src/utf32_le.c b/ext/mbstring/oniguruma/src/utf32_le.c
index dc3fd92806..f32ce9a61c 100644
--- a/ext/mbstring/oniguruma/src/utf32_le.c
+++ b/ext/mbstring/oniguruma/src/utf32_le.c
@@ -67,6 +67,7 @@ utf32le_is_mbc_newline(const UChar* p, const UChar* end)
 static OnigCodePoint
 utf32le_mbc_to_code(const UChar* p, const UChar* end ARG_UNUSED)
 {
+  if (end - p < 4) return 0;
   return (OnigCodePoint )(((p[3] * 256 + p[2]) * 256 + p[1]) * 256 + p[0]);
 }