[Mlir-commits] [mlir] Fix null pointer dereference in logging in mlir TransformOps (PR #92237)

[Daniel Kuts]

https://github.com/apach301 updated https://github.com/llvm/llvm-project/pull/92237

>From 6b4ae7eba054c0879a9139bd746fdb4ffc9ec258 Mon Sep 17 00:00:00 2001
From: Daniil Kutz <kutz at ispras.ru>
Date: Wed, 15 May 2024 12:21:19 +0300
Subject: [PATCH] Fix null pointer dereference in logging in mlir TransformOps

---
 mlir/lib/Dialect/Transform/IR/TransformOps.cpp | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/mlir/lib/Dialect/Transform/IR/TransformOps.cpp b/mlir/lib/Dialect/Transform/IR/TransformOps.cpp
index eb09f007fbca8..247759e21efb1 100644
--- a/mlir/lib/Dialect/Transform/IR/TransformOps.cpp
+++ b/mlir/lib/Dialect/Transform/IR/TransformOps.cpp
@@ -648,13 +648,14 @@ LogicalResult transform::ApplyConversionPatternsOp::verify() {
     if (!llvm::hasSingleElement(typeConverterRegion.front()))
       return emitOpError()
              << "expected exactly one op in default type converter region";
+    Operation *maybeTypeConverter = &typeConverterRegion.front().front();
     auto typeConverterOp = dyn_cast<transform::TypeConverterBuilderOpInterface>(
-        &typeConverterRegion.front().front());
+        maybeTypeConverter);
     if (!typeConverterOp) {
       InFlightDiagnostic diag = emitOpError()
                                 << "expected default converter child op to "
                                    "implement TypeConverterBuilderOpInterface";
-      diag.attachNote(typeConverterOp->getLoc()) << "op without interface";
+      diag.attachNote(maybeTypeConverter->getLoc()) << "op without interface";
       return diag;
     }
     // Check default type converter type.