From 2b35d80834f14011f7d313f8fac7855dc9949f70 Mon Sep 17 00:00:00 2001
From: nagachika <nagachika@ruby-lang.org>
Date: Sat, 6 Jul 2024 15:55:04 +0900
Subject: [PATCH] merge revision(s) 75aaeb35b82da26359b9418d2963384d0c55839c:
 [Backport #20239]

	[Bug #20239] Fix overflow at down-casting
---
 regenc.c  | 2 +-
 regexec.c | 2 +-
 version.h | 2 +-
 3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/regenc.c b/regenc.c
index fc131d2533..eb523e1ae5 100644
--- a/regenc.c
+++ b/regenc.c
@@ -57,7 +57,7 @@ onigenc_mbclen(const OnigUChar* p,const OnigUChar* e, OnigEncoding enc)
   int ret = ONIGENC_PRECISE_MBC_ENC_LEN(enc, p, e);
   if (ONIGENC_MBCLEN_CHARFOUND_P(ret)) {
     ret = ONIGENC_MBCLEN_CHARFOUND_LEN(ret);
-    if (ret > (int)(e - p)) ret = (int)(e - p); // just for case
+    if (p + ret > e) ret = (int)(e - p); // just for case
     return ret;
   }
   else if (ONIGENC_MBCLEN_NEEDMORE_P(ret)) {
diff --git a/regexec.c b/regexec.c
index 549cacb473..47fc88c9c2 100644
--- a/regexec.c
+++ b/regexec.c
@@ -3293,7 +3293,7 @@ match_at(regex_t* reg, const UChar* str, const UChar* end,
 	n = pend - pstart;
 	DATA_ENSURE(n);
 	sprev = s;
-	STRING_CMP_IC(case_fold_flag, pstart, &s, (int)n, end);
+	STRING_CMP_IC(case_fold_flag, pstart, &s, n, end);
 	while (sprev + (len = enclen_approx(encode, sprev, end)) < s)
 	  sprev += len;
 
diff --git a/version.h b/version.h
index 18bc0ae137..750de53ec3 100644
--- a/version.h
+++ b/version.h
@@ -11,7 +11,7 @@
 # define RUBY_VERSION_MINOR RUBY_API_VERSION_MINOR
 #define RUBY_VERSION_TEENY 4
 #define RUBY_RELEASE_DATE RUBY_RELEASE_YEAR_STR"-"RUBY_RELEASE_MONTH_STR"-"RUBY_RELEASE_DAY_STR
-#define RUBY_PATCHLEVEL 182
+#define RUBY_PATCHLEVEL 183
 
 #include "ruby/version.h"
 #include "ruby/internal/abi.h"