[clang] [Clang] Initialize AtLeastAsSpecialized to prevent undefined behavior… (PR #95195)

[via cfe-commits]

https://github.com/smanna12 created https://github.com/llvm/llvm-project/pull/95195

… in Sema::isTemplateTemplateParameterAtLeastAsSpecializedAs()

This patch fixes a static analyzer bug where the boolean variable `AtLeastAsSpecialized` was used uninitialized. The variable is now explicitly initialized to false before its potential modification within a lambda function to ensure that it always holds a valid value when returned, preventing undefined behavior due to uninitialized variable usage in `Sema::isTemplateTemplateParameterAtLeastAsSpecializedAs()`.

>From d73bb37285e7ec440fe5906d7b0e8177ab9d61cb Mon Sep 17 00:00:00 2001
From: "Manna, Soumi" <soumi.manna at intel.com>
Date: Tue, 11 Jun 2024 21:38:47 -0700
Subject: [PATCH] [Clang] Initialize AtLeastAsSpecialized to prevent undefined
 behavior in Sema::isTemplateTemplateParameterAtLeastAsSpecializedAs()

This patch fixes a static analyzer bug where the boolean variable `AtLeastAsSpecialized` was used uninitialized. The variable is now explicitly initialized to false before its potential modification within a lambda function to ensure that it always holds a valid value when returned, preventing undefined behavior due to uninitialized variable usage in `Sema::isTemplateTemplateParameterAtLeastAsSpecializedAs()`.
---
 clang/lib/Sema/SemaTemplateDeduction.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/clang/lib/Sema/SemaTemplateDeduction.cpp b/clang/lib/Sema/SemaTemplateDeduction.cpp
index befeb38e1fe5b..df0d6908d0a78 100644
--- a/clang/lib/Sema/SemaTemplateDeduction.cpp
+++ b/clang/lib/Sema/SemaTemplateDeduction.cpp
@@ -6447,7 +6447,7 @@ bool Sema::isTemplateTemplateParameterAtLeastAsSpecializedAs(
   if (Inst.isInvalid())
     return false;
 
-  bool AtLeastAsSpecialized;
+  bool AtLeastAsSpecialized = false;
   runWithSufficientStackSpace(Info.getLocation(), [&] {
     AtLeastAsSpecialized =
         ::FinishTemplateArgumentDeduction(