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probe and copy hdc from usermode PAINTSTRUCT using SEH

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svn path=/trunk/; revision=28028
This commit is contained in:
Timo Kreuzer 2007-07-30 01:39:26 +00:00
parent 7f423ecbdb
commit 0aa1be9e3f
1 changed files with 19 additions and 2 deletions
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21
reactos/subsystems/win32/win32k/ntuser/painting.c
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@ -870,11 +870,13 @@ CLEANUP:
*/
BOOL STDCALL
NtUserEndPaint(HWND hWnd, CONST PAINTSTRUCT* lPs)
NtUserEndPaint(HWND hWnd, CONST PAINTSTRUCT* pUnsafePs)
{
NTSTATUS Status = STATUS_SUCCESS;
PWINDOW_OBJECT Window;
DECLARE_RETURN(BOOL);
USER_REFERENCE_ENTRY Ref;
HDC hdc = NULL;
DPRINT("Enter NtUserEndPaint\n");
UserEnterExclusive();
@ -884,7 +886,22 @@ NtUserEndPaint(HWND hWnd, CONST PAINTSTRUCT* lPs)
RETURN(FALSE);
}
UserReleaseDC(Window, lPs->hdc, TRUE);
_SEH_TRY
{
ProbeForRead(pUnsafePs, sizeof(*pUnsafePs), 1);
hdc = pUnsafePs->hdc;
}
_SEH_HANDLE
{
Status = _SEH_GetExceptionCode();
}
_SEH_END
if (!NT_SUCCESS(Status))
{
RETURN(FALSE);
}
UserReleaseDC(Window, hdc, TRUE);
UserRefObjectCo(Window, &Ref);
co_UserShowCaret(Window);