From 616b93b0239bfc54be3cc05955f22e6a07ed0127 Mon Sep 17 00:00:00 2001
From: "jan.nijtmans" <nijtmans@users.sourceforge.net>
Date: Fri, 8 Apr 2022 09:10:22 +0000
Subject: Fix [05ff16e799]: signed integer overflow in
 ExtendStringRepWithUnicode()

---
 generic/tclStringObj.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/generic/tclStringObj.c b/generic/tclStringObj.c
index 4afd12a..b81e711 100644
--- a/generic/tclStringObj.c
+++ b/generic/tclStringObj.c
@@ -3341,7 +3341,7 @@ ExtendStringRepWithUnicode(
     }
 
     for (i = 0; i < numChars && size >= 0; i++) {
-	size += Tcl_UniCharToUtf((int) unicode[i], buf);
+	size += (unsigned int)Tcl_UniCharToUtf((int) unicode[i], buf);
     }
     if (size < 0) {
 	Tcl_Panic("max size for a Tcl value (%d bytes) exceeded", INT_MAX);
-- 
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