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Merge pull request #18329 from azat/buffer-rollback-fix

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Fix NULL dereference in Buffer rollback
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alexey-milovidov 2020-12-22 09:30:53 +03:00 committed by GitHub
commit c1bd8d5df5
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1 changed files with 14 additions and 3 deletions
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17
src/Storages/StorageBuffer.cpp
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@ -386,16 +386,17 @@ static void appendBlock(const Block & from, Block & to)
MemoryTracker::BlockerInThread temporarily_disable_memory_tracker;
MutableColumnPtr last_col;
try
{
for (size_t column_no = 0, columns = to.columns(); column_no < columns; ++column_no)
{
const IColumn & col_from = *from.getByPosition(column_no).column.get();
MutableColumnPtr col_to = IColumn::mutate(std::move(to.getByPosition(column_no).column));
last_col = IColumn::mutate(std::move(to.getByPosition(column_no).column));
col_to->insertRangeFrom(col_from, 0, rows);
last_col->insertRangeFrom(col_from, 0, rows);
to.getByPosition(column_no).column = std::move(col_to);
to.getByPosition(column_no).column = std::move(last_col);
}
}
catch (...)
@ -406,6 +407,16 @@ static void appendBlock(const Block & from, Block & to)
for (size_t column_no = 0, columns = to.columns(); column_no < columns; ++column_no)
{
ColumnPtr & col_to = to.getByPosition(column_no).column;
/// If there is no column, then the exception was thrown in the middle of append, in the insertRangeFrom()
if (!col_to)
{
col_to = std::move(last_col);
/// Suppress clang-tidy [bugprone-use-after-move]
last_col = {};
}
/// But if there is still nothing, abort
if (!col_to)
throw Exception("No column to rollback", ErrorCodes::LOGICAL_ERROR);
if (col_to->size() != old_rows)
col_to = col_to->cut(0, old_rows);
}