From c7c393169865843cd826ff37f217561ffae7c647 Mon Sep 17 00:00:00 2001
From: Egor Bogatov <egorbo@gmail.com>
Date: Tue, 23 Aug 2022 17:37:33 +0200
Subject: [PATCH] Fix strnstr (#74421)

---
 src/coreclr/jit/jitconfig.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/coreclr/jit/jitconfig.cpp b/src/coreclr/jit/jitconfig.cpp
index b74291ea837..cd65af36f10 100644
--- a/src/coreclr/jit/jitconfig.cpp
+++ b/src/coreclr/jit/jitconfig.cpp
@@ -323,6 +323,11 @@ void JitConfigValues::MethodSet::destroy(ICorJitHost* host)
 // strstr that is length-limited, this implementation is not intended to be used on hot paths
 static size_t strnstr(const char* pSrc, size_t srcSize, const char* needle, size_t needleSize)
 {
+    if (srcSize < needleSize)
+    {
+        return -1;
+    }
+
     for (size_t srcPos = 0; srcPos <= srcSize - needleSize; srcPos++)
     {
         if (strncmp(pSrc + srcPos, needle, needleSize) == 0)
-- 
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