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[WIN32K]

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Fix a bug in GDIOBJ_LockObj, that would cause a deadlock, when an object was deleted while another thread was waiting to acquire the handle lock.

svn path=/trunk/; revision=50804
This commit is contained in:
Timo Kreuzer 2011-02-18 15:08:50 +00:00
parent 269bbf1328
commit 5e45b1eb7a
1 changed files with 11 additions and 10 deletions
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21
reactos/subsystems/win32/win32k/objects/gdiobj.c
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@ -1005,16 +1005,6 @@ GDIOBJ_LockObj(HGDIOBJ hObj, DWORD ExpectedType)
}
ProcessId = (HANDLE)((ULONG_PTR)PsGetCurrentProcessId() & ~1);
HandleProcessId = (HANDLE)((ULONG_PTR)Entry->ProcessId & ~1);
/* Check for invalid owner. */
if (ProcessId != HandleProcessId && HandleProcessId != NULL)
{
DPRINT1("Tried to lock object (0x%p) of wrong owner! ProcessId = %p, HandleProcessId = %p\n", hObj, ProcessId, HandleProcessId);
GDIDBG_TRACECALLER();
GDIDBG_TRACEALLOCATOR(hObj);
return NULL;
}
/*
* Prevent the thread from being terminated during the locking process.
@ -1031,6 +1021,17 @@ GDIOBJ_LockObj(HGDIOBJ hObj, DWORD ExpectedType)
for (;;)
{
HandleProcessId = (HANDLE)((ULONG_PTR)Entry->ProcessId & ~1);
/* Check for invalid owner. */
if (ProcessId != HandleProcessId && HandleProcessId != NULL)
{
DPRINT1("Tried to lock object (0x%p) of wrong owner! ProcessId = %p, HandleProcessId = %p\n", hObj, ProcessId, HandleProcessId);
GDIDBG_TRACECALLER();
GDIDBG_TRACEALLOCATOR(hObj);
break;
}
/* Lock the handle table entry. */
LockedProcessId = (HANDLE)((ULONG_PTR)HandleProcessId | 0x1);
PrevProcId = InterlockedCompareExchangePointer((PVOID*)&Entry->ProcessId,