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AK: Take the bump-allocated chunk header into account in destroy_all()

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Previously we allowed the end_offset to be larger than the chunk itself,
which made it so that certain input sizes would make the logic attempt
to delete a nonexistent object.
Fixes #16308.
This commit is contained in:
Ali Mohammad Pur 2022-12-05 00:13:47 +03:30 committed by Andreas Kling
parent 57dc179b1f
commit c500647eee
Notes: sideshowbarker 2024-07-17 03:43:04 +09:00 
Author: https://github.com/alimpfard
Commit: https://github.com/SerenityOS/serenity/commit/c500647eee
Pull-request: https://github.com/SerenityOS/serenity/pull/16314
Issue: https://github.com/SerenityOS/serenity/issues/16308
1 changed files with 1 additions and 1 deletions
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2
AK/BumpAllocator.h
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@ -181,7 +181,7 @@ public:
this->for_each_chunk([&](auto chunk) {
auto base_ptr = align_up_to(chunk + sizeof(typename Allocator::ChunkHeader), alignof(T));
// Compute the offset of the first byte *after* this chunk:
FlatPtr end_offset = base_ptr + this->m_chunk_size - chunk;
FlatPtr end_offset = base_ptr + this->m_chunk_size - chunk - sizeof(typename Allocator::ChunkHeader);
if (chunk == this->m_current_chunk)
end_offset = this->m_byte_offset_into_current_chunk;
// Compute the offset of the first byte *after* the last valid object, in case the end of the chunk does not align with the end of an object: