[clang] [alpha.webkit.RetainPtrCtorAdoptChecker] Check nullity before calling IgnoreParenCasts. (PR #137556)

[Ryosuke Niwa via cfe-commits]

https://github.com/rniwa created https://github.com/llvm/llvm-project/pull/137556

None

>From 46d5c45c4c7a6abe0255aa31e2c7435d7f3e8289 Mon Sep 17 00:00:00 2001
From: Ryosuke Niwa <rniwa at webkit.org>
Date: Sun, 27 Apr 2025 15:16:40 -0700
Subject: [PATCH] [alpha.webkit.RetainPtrCtorAdoptChecker] Check nullity before
 calling IgnoreParenCasts.

---
 .../Checkers/WebKit/RetainPtrCtorAdoptChecker.cpp              | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/clang/lib/StaticAnalyzer/Checkers/WebKit/RetainPtrCtorAdoptChecker.cpp b/clang/lib/StaticAnalyzer/Checkers/WebKit/RetainPtrCtorAdoptChecker.cpp
index bba1d48e6db11..34c98daa78049 100644
--- a/clang/lib/StaticAnalyzer/Checkers/WebKit/RetainPtrCtorAdoptChecker.cpp
+++ b/clang/lib/StaticAnalyzer/Checkers/WebKit/RetainPtrCtorAdoptChecker.cpp
@@ -444,9 +444,10 @@ class RetainPtrCtorAdoptChecker
       return false;
     if (!ObjCMsgExpr->isInstanceMessage())
       return false;
-    auto *Receiver = ObjCMsgExpr->getInstanceReceiver()->IgnoreParenCasts();
+    auto *Receiver = ObjCMsgExpr->getInstanceReceiver();
     if (!Receiver)
       return false;
+    Receiver = Receiver->IgnoreParenCasts();
     if (auto *Inner = dyn_cast<ObjCMessageExpr>(Receiver)) {
       if (InnerExpr)
         *InnerExpr = Inner;