[clang] 79f6ae0 - [Clang][NFC] Fix potential null dereference in encodeTypeForFunctionPointerAuth (#104737)

[via cfe-commits]

Author: smanna12
Date: 2024-08-19T09:37:06-05:00
New Revision: 79f6ae05c139d3d5b6446f8a265a3c6e3f5b18f8

URL: https://github.com/llvm/llvm-project/commit/79f6ae05c139d3d5b6446f8a265a3c6e3f5b18f8
DIFF: https://github.com/llvm/llvm-project/commit/79f6ae05c139d3d5b6446f8a265a3c6e3f5b18f8.diff

LOG: [Clang][NFC] Fix potential null dereference in encodeTypeForFunctionPointerAuth (#104737)

This patch replaces getAs with castAs in
encodeTypeForFunctionPointerAuth to prevent dereferencing a potential
null pointer, enhancing type safety as reported by static analyzer tool.

Added: 
    

Modified: 
    clang/lib/AST/ASTContext.cpp

Removed: 
    


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diff  --git a/clang/lib/AST/ASTContext.cpp b/clang/lib/AST/ASTContext.cpp
index f35a025fc8edf..b201d201e1ea6 100644
--- a/clang/lib/AST/ASTContext.cpp
+++ b/clang/lib/AST/ASTContext.cpp
@@ -3279,7 +3279,7 @@ static void encodeTypeForFunctionPointerAuth(const ASTContext &Ctx,
 
   case Type::MemberPointer: {
     OS << "M";
-    const auto *MPT = T->getAs<MemberPointerType>();
+    const auto *MPT = T->castAs<MemberPointerType>();
     encodeTypeForFunctionPointerAuth(Ctx, OS, QualType(MPT->getClass(), 0));
     encodeTypeForFunctionPointerAuth(Ctx, OS, MPT->getPointeeType());
     return;