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[bug](branch-2.0) Fix heap-use-after-free in the bitmap functions #27521

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merged 1 commit into from
Nov 24, 2023
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[bug](branch-2.0) Fix heap-use-after-free in the bitmap functions #27521

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3 changes: 2 additions & 1 deletion be/src/util/bitmap_value.h
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Original file line number Diff line number Diff line change
Expand Up @@ -2172,7 +2172,7 @@ class BitmapValue {

// Return how many bytes are required to serialize this bitmap.
// See BitmapTypeCode for the serialized format.
size_t getSizeInBytes() const {
size_t getSizeInBytes() {
size_t res = 0;
switch (_type) {
case EMPTY:
Expand All @@ -2186,6 +2186,7 @@ class BitmapValue {
}
break;
case BITMAP:
_prepare_bitmap_for_write();
_bitmap->runOptimize();
_bitmap->shrinkToFit();
res = _bitmap->getSizeInBytes(config::bitmap_serialize_version);
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3 changes: 2 additions & 1 deletion be/src/vec/data_types/data_type_bitmap.cpp
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Expand Up @@ -114,7 +114,8 @@ void DataTypeBitMap::to_string(const IColumn& column, size_t row_num, BufferWrit
ColumnPtr ptr = result.first;
row_num = result.second;

const auto& data = assert_cast<const ColumnBitmap&>(*ptr).get_element(row_num);
auto& data =
const_cast<BitmapValue&>(assert_cast<const ColumnBitmap&>(*ptr).get_element(row_num));
std::string buffer(data.getSizeInBytes(), '0');
data.write_to(const_cast<char*>(buffer.data()));
ostr.write(buffer.c_str(), buffer.size());
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