[Webkit-unassigned] [Bug 193664] [WinCairo][WebKitTestRunner] Null dereference of GraphicsContext::m_data in GraphicsContext::releaseWindowsContext

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=193664

--- Comment #3 from Fujii Hironori <Hironori.Fujii at sony.com> ---
In RenderThemeWin::paintMeter, completedRect has zero width.

> completedRect	{m_location={m_x=8 m_y=7 } m_size={m_width=0 m_height=16 } }	WebCore::IntRect

Then, GraphicsContext::getWindowsContext returned 0.
https://github.com/WebKit/webkit/blob/5f7dcb377532103d4561192cd2197de0bd78c372/Source/WebCore/platform/graphics/win/GraphicsContextWin.cpp#L110

Then, LocalWindowsContext::~LocalWindowsContext tried to release zero HDC, and crashed.

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