[clang] [Clang] Added nullptr check to getFriendDecl access (PR #121056)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: None (GrumpyPigSkin)

<details>
<summary>Changes</summary>

fixes: #<!-- -->120857 where a `nullptr` access was causing a crash.

@<!-- -->shafik please can you review. 

---
Full diff: https://github.com/llvm/llvm-project/pull/121056.diff


1 Files Affected:

- (modified) clang/lib/Sema/SemaDeclCXX.cpp (+3-2) 


``````````diff
diff --git a/clang/lib/Sema/SemaDeclCXX.cpp b/clang/lib/Sema/SemaDeclCXX.cpp
index c5a72cf812ebc9..64b1fb28e2e184 100644
--- a/clang/lib/Sema/SemaDeclCXX.cpp
+++ b/clang/lib/Sema/SemaDeclCXX.cpp
@@ -8871,8 +8871,9 @@ bool Sema::CheckExplicitlyDefaultedComparison(Scope *S, FunctionDecl *FD,
       return true;
 
     if (llvm::none_of(RD->friends(), [&](const FriendDecl *F) {
-          return FD->getCanonicalDecl() ==
-                 F->getFriendDecl()->getCanonicalDecl();
+          if (NamedDecl* Ffd = F->getFriendDecl())
+            return FD->getCanonicalDecl() == Ffd->getCanonicalDecl();
+          return false;
         })) {
       Diag(FD->getLocation(), diag::err_defaulted_comparison_not_friend)
           << int(DCK) << int(0) << RD;

``````````

</details>


https://github.com/llvm/llvm-project/pull/121056