https://github.com/Mr-Anyone created
https://github.com/llvm/llvm-project/pull/155506
Prevent a crash in `__builtin_function_start` by adding a check for an invalid
first parameter.
fixes #113323
>From 3bb8b9fa901324a2bef20a112ffa957a82bea84b Mon Sep 17 00:00:00 2001
From: Vincent <l...@viceroygroup.ca>
Date: Thu, 14 Aug 2025 21:50:47 +0800
Subject: [PATCH] [clang] Fix crash when __builtin_function_start is given an
invalid first parameter
Prevent a crash in __builtin_function_start by adding a check for an invalid
first parameter.
fixes #113323
---
clang/docs/ReleaseNotes.rst | 2 ++
clang/lib/Sema/SemaChecking.cpp | 3 +++
clang/test/SemaCXX/gh113323.cpp | 5 +++++
3 files changed, 10 insertions(+)
create mode 100644 clang/test/SemaCXX/gh113323.cpp
diff --git a/clang/docs/ReleaseNotes.rst b/clang/docs/ReleaseNotes.rst
index 9a05eea9de8ac..9cd8a10b72c36 100644
--- a/clang/docs/ReleaseNotes.rst
+++ b/clang/docs/ReleaseNotes.rst
@@ -258,6 +258,8 @@ Bug Fixes in This Version
targets that treat ``_Float16``/``__fp16`` as native scalar types. Previously
the warning was silently lost because the operands differed only by an
implicit
cast chain. (#GH149967).
+- Fix crash in ``__builtin_function_start`` by checking for invalid
+ first parameter. (#GH113323).
- Fixed a crash with incompatible pointer to integer conversions in designated
initializers involving string literals. (#GH154046)
- Clang now emits a frontend error when a function marked with the `flatten`
attribute
diff --git a/clang/lib/Sema/SemaChecking.cpp b/clang/lib/Sema/SemaChecking.cpp
index 6e777fb9aec8e..d137ccb95d295 100644
--- a/clang/lib/Sema/SemaChecking.cpp
+++ b/clang/lib/Sema/SemaChecking.cpp
@@ -286,6 +286,9 @@ static bool BuiltinFunctionStart(Sema &S, CallExpr
*TheCall) {
if (S.checkArgCount(TheCall, 1))
return true;
+ if(TheCall->getArg(0)->containsErrors())
+ return true;
+
ExprResult Arg = S.DefaultFunctionArrayLvalueConversion(TheCall->getArg(0));
if (Arg.isInvalid())
return true;
diff --git a/clang/test/SemaCXX/gh113323.cpp b/clang/test/SemaCXX/gh113323.cpp
new file mode 100644
index 0000000000000..c753407b6932b
--- /dev/null
+++ b/clang/test/SemaCXX/gh113323.cpp
@@ -0,0 +1,5 @@
+// RUN: %clang_cc1 -fsyntax-only -verify %s
+
+int a() {} // expected-warning {{non-void function does not return a value}}
+constexpr void (*d)() = a; // expected-error {{cannot initialize a variable of
type}}
+const void *f = __builtin_function_start(d);
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