[clang] [Clang] [NFC] Prevent null pointer dereference in Sema::InstantiateFunctionDefinition (PR #89801)

[via cfe-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: None (smanna12)

<details>
<summary>Changes</summary>

…nctionDefinition

In the lambda function within clang::Sema::InstantiateFunctionDefinition, the return value of a function that may return null is now checked before dereferencing to avoid potential null pointer dereference issues.

---
Full diff: https://github.com/llvm/llvm-project/pull/89801.diff


1 Files Affected:

- (modified) clang/lib/Sema/SemaTemplateInstantiateDecl.cpp (+2) 


``````````diff
diff --git a/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp b/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
index 787a485e0b2f8c..2490ec4ca614a8 100644
--- a/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
+++ b/clang/lib/Sema/SemaTemplateInstantiateDecl.cpp
@@ -5183,7 +5183,9 @@ void Sema::InstantiateFunctionDefinition(SourceLocation PointOfInstantiation,
     Function->setTypeSourceInfo(NewSI);
 
     ParmVarDecl *Parm = Function->getParamDecl(0);
+    assert(Parm && "First parameter not found in function declaration.");
     TypeSourceInfo *NewParmSI = IR.TransformType(Parm->getTypeSourceInfo());
+    assert(NewParmSI && "Type transformation failed.");
     Parm->setType(NewParmSI->getType());
     Parm->setTypeSourceInfo(NewParmSI);
   };

``````````

</details>


https://github.com/llvm/llvm-project/pull/89801