pitrou commented on code in PR #54939:
URL: https://github.com/apache/arrow/pull/54939#discussion_r4410835992
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cpp/src/arrow/ipc/reader.cc:
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@@ -455,6 +456,21 @@ class ArrayLoader {
Status Visit(const MapType& type) {
RETURN_NOT_OK(LoadList(type));
+ if (!out_->child_data.empty()) {
+ // Ensure that GetNullCount() calls in MapArray::ValidateChildData
+ // don't access invalid memory.
Review Comment:
Yes, I'd rather rely on the fuzz-generated file (or any other "bad data"
file) than adding such maintenance burden to the unit test suite.
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