From 40c325322e3c3d013de4ac3b5d114f1d77f9cace Mon Sep 17 00:00:00 2001
From: Burkov Egor <eburkov@rvision.ru>
Date: Mon, 3 Feb 2025 17:19:55 +0300
Subject: [PATCH] ICU-23035 Fix bound check at `u_strToPunycode`

---
 icu4c/source/common/punycode.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/icu4c/source/common/punycode.cpp b/icu4c/source/common/punycode.cpp
index aa02298c5e6..1868a07a856 100644
--- a/icu4c/source/common/punycode.cpp
+++ b/icu4c/source/common/punycode.cpp
@@ -193,7 +193,7 @@ u_strToPunycode(const char16_t *src, int32_t srcLength,
         return 0;
     }
 
-    if(src==nullptr || srcLength<-1 || (dest==nullptr && destCapacity!=0)) {
+    if(src==nullptr || srcLength<-1 || destCapacity<0 || (dest==nullptr && destCapacity!=0)) {
         *pErrorCode=U_ILLEGAL_ARGUMENT_ERROR;
         return 0;
     }