[GitHub] [arrow] emkornfield commented on a change in pull request #8626: ARROW-10545: [C++] Fix crash on invalid Parquet file (OSS-Fuzz)

[GitBox <gi...@apache.org>]

emkornfield commented on a change in pull request #8626:
URL: https://github.com/apache/arrow/pull/8626#discussion_r520732790



##########
File path: cpp/src/parquet/level_conversion.cc
##########
@@ -35,16 +36,17 @@ namespace internal {
 namespace {
 
 using ::arrow::internal::CpuInfo;
+using ::arrow::util::optional;
 
 template <typename OffsetType>
 void DefRepLevelsToListInfo(const int16_t* def_levels, const int16_t* rep_levels,
                             int64_t num_def_levels, LevelInfo level_info,
                             ValidityBitmapInputOutput* output, OffsetType* offsets) {
   OffsetType* orig_pos = offsets;
-  std::unique_ptr<::arrow::internal::FirstTimeBitmapWriter> valid_bits_writer;
+  optional<::arrow::internal::FirstTimeBitmapWriter> valid_bits_writer;
   if (output->valid_bits) {
-    valid_bits_writer.reset(new ::arrow::internal::FirstTimeBitmapWriter(
-        output->valid_bits, output->valid_bits_offset, num_def_levels));
+    valid_bits_writer.emplace(output->valid_bits, output->valid_bits_offset,
+                              output->values_read_upper_bound);

Review comment:
       :( nice catch.




----------------------------------------------------------------
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.

For queries about this service, please contact Infrastructure at:
users@infra.apache.org