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AK: Fix ByteBuffer zero bytes allocations

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Tom 2020-08-30 09:00:57 -06:00 committed by Andreas Kling
parent 9ad5a261f7
commit f5bc7dbfda
Notes: sideshowbarker 2024-07-19 03:00:00 +09:00 
Author: https://github.com/tomuta
Commit: https://github.com/SerenityOS/serenity/commit/f5bc7dbfda0
Pull-request: https://github.com/SerenityOS/serenity/pull/3355
1 changed files with 17 additions and 5 deletions
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22
AK/ByteBuffer.h
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@ -256,7 +256,8 @@ private:
inline ByteBufferImpl::ByteBufferImpl(size_t size)
: m_size(size)
{
m_data = static_cast<u8*>(kmalloc(size));
if (size != 0)
m_data = static_cast<u8*>(kmalloc(size));
m_owned = true;
}
@ -264,8 +265,10 @@ inline ByteBufferImpl::ByteBufferImpl(const void* data, size_t size, Constructio
: m_size(size)
{
ASSERT(mode == Copy);
m_data = static_cast<u8*>(kmalloc(size));
__builtin_memcpy(m_data, data, size);
if (size != 0) {
m_data = static_cast<u8*>(kmalloc(size));
__builtin_memcpy(m_data, data, size);
}
m_owned = true;
}
@ -284,12 +287,20 @@ inline void ByteBufferImpl::grow(size_t size)
{
ASSERT(size > m_size);
ASSERT(m_owned);
if (size == 0) {
if (m_data)
kfree(m_data);
m_data = nullptr;
m_size = 0;
return;
}
u8* new_data = static_cast<u8*>(kmalloc(size));
__builtin_memcpy(new_data, m_data, m_size);
u8* old_data = m_data;
m_data = new_data;
m_size = size;
kfree(old_data);
if (old_data)
kfree(old_data);
}
inline NonnullRefPtr<ByteBufferImpl> ByteBufferImpl::create_uninitialized(size_t size)
@ -300,7 +311,8 @@ inline NonnullRefPtr<ByteBufferImpl> ByteBufferImpl::create_uninitialized(size_t
inline NonnullRefPtr<ByteBufferImpl> ByteBufferImpl::create_zeroed(size_t size)
{
auto buffer = ::adopt(*new ByteBufferImpl(size));
__builtin_memset(buffer->data(), 0, size);
if (size != 0)
__builtin_memset(buffer->data(), 0, size);
return buffer;
}