[GitHub] [arrow] pitrou commented on a diff in pull request #35996: GH-35988: [C#] The C data interface implementation can leak on import

["pitrou (via GitHub)" <gi...@apache.org>]

pitrou commented on code in PR #35996:
URL: https://github.com/apache/arrow/pull/35996#discussion_r1223336191


##########
csharp/src/Apache.Arrow/C/CArrowArrayImporter.cs:
##########
@@ -90,42 +96,49 @@ public static unsafe RecordBatch ImportRecordBatch(CArrowArray* ptr, Schema sche
 
         private sealed unsafe class ImportedArrowArray : ImportedAllocationOwner
         {
-            private readonly CArrowArray* _cArray;
+            private readonly CArrowArray _cArray;
 
             public ImportedArrowArray(CArrowArray* cArray)
             {
                 if (cArray == null)
                 {
                     throw new ArgumentNullException(nameof(cArray));
                 }
-                _cArray = cArray;
-                if (_cArray->release == null)
+                if (cArray->release == null)
                 {
                     throw new ArgumentException("Tried to import an array that has already been released.", nameof(cArray));
                 }
+                _cArray = *cArray;
+                cArray->release = null;
             }
 
             protected override void FinalRelease()
             {
-                if (_cArray->release != null)
+                if (_cArray.release != null)
                 {
-                    _cArray->release(_cArray);
+                    fixed (CArrowArray* cArray = &_cArray)
+                    {
+                        cArray->release(cArray);
+                    }

Review Comment:
   I'm curious, why not simply:
   ```suggestion
                       _cArray.release(&_cArray);
   ```



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