[clang] ca61bdd - [Clang] Prevent null pointer dereference in TransformUnaryTransformType() (#97912)

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Author: smanna12
Date: 2024-07-16T12:24:57-05:00
New Revision: ca61bdde476aae4d179f16561ce4d245df9f0fdf

URL: https://github.com/llvm/llvm-project/commit/ca61bdde476aae4d179f16561ce4d245df9f0fdf
DIFF: https://github.com/llvm/llvm-project/commit/ca61bdde476aae4d179f16561ce4d245df9f0fdf.diff

LOG: [Clang] Prevent null pointer dereference in TransformUnaryTransformType() (#97912)

This patch adds null check after TransformType call to avoid
dereferencing a null pointer when calling getType().

Added: 
    

Modified: 
    clang/lib/Sema/TreeTransform.h

Removed: 
    


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diff  --git a/clang/lib/Sema/TreeTransform.h b/clang/lib/Sema/TreeTransform.h
index 655f248d11383..79bc5e5c55c87 100644
--- a/clang/lib/Sema/TreeTransform.h
+++ b/clang/lib/Sema/TreeTransform.h
@@ -6737,8 +6737,13 @@ QualType TreeTransform<Derived>::TransformUnaryTransformType(
   QualType Result = TL.getType();
   if (Result->isDependentType()) {
     const UnaryTransformType *T = TL.getTypePtr();
-    QualType NewBase =
-      getDerived().TransformType(TL.getUnderlyingTInfo())->getType();
+
+    TypeSourceInfo *NewBaseTSI =
+        getDerived().TransformType(TL.getUnderlyingTInfo());
+    if (!NewBaseTSI)
+      return QualType();
+    QualType NewBase = NewBaseTSI->getType();
+
     Result = getDerived().RebuildUnaryTransformType(NewBase,
                                                     T->getUTTKind(),
                                                     TL.getKWLoc());