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[NTOSKRNL] Use interlocked operations when dealing with map count.

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CORE-14349
This commit is contained in:
Pierre Schweitzer 2018-04-08 18:58:15 +02:00
parent 1b672981e2
commit 40017a54f9
1 changed files with 7 additions and 10 deletions
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17
ntoskrnl/cc/view.c
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@ -344,7 +344,7 @@ retry:
CcRosVacbIncRefCount(current);
/* Check if it's mapped and not dirty */
if (current->MappedCount > 0 && !current->Dirty)
if (InterlockedCompareExchange((PLONG)&current->MappedCount, 0, 0) > 0 && !current->Dirty)
{
/* We have to break these locks because Cc sucks */
KeReleaseSpinLock(&current->SharedCacheMap->CacheMapLock, oldIrql);
@ -448,14 +448,13 @@ CcRosReleaseVacb (
if (Mapped)
{
Vacb->MappedCount++;
}
Refs = CcRosVacbDecRefCount(Vacb);
if (Mapped && (Vacb->MappedCount == 1))
{
CcRosVacbIncRefCount(Vacb);
if (InterlockedIncrement((PLONG)&Vacb->MappedCount) == 1)
{
CcRosVacbIncRefCount(Vacb);
}
}
Refs = CcRosVacbDecRefCount(Vacb);
ASSERT(Refs > 0);
CcRosReleaseVacbLock(Vacb);
@ -630,9 +629,7 @@ CcRosUnmapVacb (
}
ASSERT(Vacb->MappedCount != 0);
Vacb->MappedCount--;
if (Vacb->MappedCount == 0)
if (InterlockedDecrement((PLONG)&Vacb->MappedCount) == 0)
{
CcRosVacbDecRefCount(Vacb);
}