[clang] [-Wunsafe-buffer-usage] Fix AST matcher of UUCAddAssignGadget (PR #79392)

[via cfe-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang-analysis

Author: None (jkorous-apple)

<details>
<summary>Changes</summary>

We are not interested in nonpointers being added to.

---
Full diff: https://github.com/llvm/llvm-project/pull/79392.diff


1 Files Affected:

- (modified) clang/lib/Analysis/UnsafeBufferUsage.cpp (+6-1) 


``````````diff
diff --git a/clang/lib/Analysis/UnsafeBufferUsage.cpp b/clang/lib/Analysis/UnsafeBufferUsage.cpp
index 7df706beb22662c..fd7a76d511862ec 100644
--- a/clang/lib/Analysis/UnsafeBufferUsage.cpp
+++ b/clang/lib/Analysis/UnsafeBufferUsage.cpp
@@ -1081,11 +1081,16 @@ class UUCAddAssignGadget : public FixableGadget {
   }
 
   static Matcher matcher() {
+// clang-format off
     return stmt(isInUnspecifiedUntypedContext(expr(ignoringImpCasts(
         binaryOperator(hasOperatorName("+="),
-                       hasLHS(declRefExpr(toSupportedVariable())),
+                       hasLHS(
+                        declRefExpr(
+                          hasPointerType(),
+                          toSupportedVariable())),
                        hasRHS(expr().bind(OffsetTag)))
             .bind(UUCAddAssignTag)))));
+// clang-format on
   }
 
   virtual std::optional<FixItList> getFixits(const Strategy &S) const override;

``````````

</details>


https://github.com/llvm/llvm-project/pull/79392