[compiler-rt] [asan][win] Fix CreateThread leak (PR #126738)

[via llvm-commits]

https://github.com/GkvJwa updated https://github.com/llvm/llvm-project/pull/126738

>From 630c45edac9e4dfa1570de04f9b254d84e5b5b51 Mon Sep 17 00:00:00 2001
From: GkvJwa <gkvjwa at gmail.com>
Date: Thu, 27 Feb 2025 15:05:06 +0800
Subject: [PATCH] [asan][win] Fix ExitThread leak

Intercept `ExitThread` and free the memory created by `VirtualAlloc'
---
 compiler-rt/lib/asan/asan_win.cpp | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/compiler-rt/lib/asan/asan_win.cpp b/compiler-rt/lib/asan/asan_win.cpp
index 09a13b11cff1f..027340280e068 100644
--- a/compiler-rt/lib/asan/asan_win.cpp
+++ b/compiler-rt/lib/asan/asan_win.cpp
@@ -145,7 +145,6 @@ static thread_return_t THREAD_CALLING_CONV asan_thread_start(void *arg) {
   t->GetStartData(params);
 
   auto res = (*params.start_routine)(params.arg);
-  t->Destroy();  // POSIX calls this from TSD destructor.
   return res;
 }
 
@@ -166,6 +165,13 @@ INTERCEPTOR_WINAPI(HANDLE, CreateThread, LPSECURITY_ATTRIBUTES security,
                             thr_flags, tid);
 }
 
+INTERCEPTOR_WINAPI(void, ExitThread, DWORD dwExitCode) {
+  AsanThread *t = (AsanThread *)__asan::GetCurrentThread();
+  if (t)
+    t->Destroy();
+  REAL(ExitThread)(dwExitCode);
+}
+
 // }}}
 
 namespace __asan {
@@ -181,6 +187,7 @@ void InitializePlatformInterceptors() {
       (LPCWSTR)&InitializePlatformInterceptors, &pinned));
 
   ASAN_INTERCEPT_FUNC(CreateThread);
+  ASAN_INTERCEPT_FUNC(ExitThread);
   ASAN_INTERCEPT_FUNC(SetUnhandledExceptionFilter);
 
 #ifdef _WIN64