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Kernel: Make Process a Weakable class.

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Use this to fix a use-after-free in ~GraphicsBitmap(). We'd hit this when
the WindowServer was doing a deferred destruction of a WSWindow whose
backing store referred to a now-reaped Process.
This commit is contained in:
Andreas Kling
2019-01-31 07:02:40 +01:00
parent fc0b63ca3c
commit 2dc9c86bad
3 changed files with 5 additions and 4 deletions
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4
SharedGraphics/GraphicsBitmap.cpp
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@@ -16,7 +16,7 @@ RetainPtr<GraphicsBitmap> GraphicsBitmap::create(Process& process, const Size& s
GraphicsBitmap::GraphicsBitmap(Process& process, const Size& size)
: m_size(size)
, m_pitch(size.width() * sizeof(RGBA32))
, m_client_process(&process)
, m_client_process(process.makeWeakPtr())
{
InterruptDisabler disabler;
size_t size_in_bytes = size.width() * size.height() * sizeof(RGBA32);
@@ -47,7 +47,7 @@ GraphicsBitmap::GraphicsBitmap(const Size& size, RGBA32* data)
GraphicsBitmap::~GraphicsBitmap()
{
#ifdef KERNEL
if (m_client_region)
if (m_client_region && m_client_process)
m_client_process->deallocate_region(*m_client_region);
if (m_server_region)
WSMessageLoop::the().server_process().deallocate_region(*m_server_region);