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- Reference/dereference the file object when working with it in the context of MPW thread. This prevents massive file operations (like copying) to crash ReactOS with writing to a freed memory exception.

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svn path=/trunk/; revision=30564
This commit is contained in:
Aleksey Bragin
2007-11-18 23:11:20 +00:00
parent 34d621bb58
commit 03be8c2b8f
1 changed files with 10 additions and 1 deletions
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reactos/ntoskrnl/cc/view.c
+10 -1
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@@ -237,10 +237,16 @@ CcRosFlushDirtyPages(ULONG Target, PULONG Count)
current = CONTAINING_RECORD(current_entry, CACHE_SEGMENT,
DirtySegmentListEntry);
current_entry = current_entry->Flink;
/* This Ros-specific function needs FileObject to be referenced,
ohterwise it may be deleted while this function still works
with it */
ObReferenceObject(current->Bcb->FileObject);
Locked = ExTryToAcquireResourceExclusiveLite(((FSRTL_COMMON_FCB_HEADER*)(current->Bcb->FileObject->FsContext))->Resource);
if (!Locked)
{
ObDereferenceObject(current->Bcb->FileObject);
continue;
}
@@ -248,6 +254,7 @@ CcRosFlushDirtyPages(ULONG Target, PULONG Count)
if (!Locked)
{
ExReleaseResourceLite(((FSRTL_COMMON_FCB_HEADER*)(current->Bcb->FileObject->FsContext))->Resource);
ObDereferenceObject(current->Bcb->FileObject);
continue;
}
@@ -256,6 +263,7 @@ CcRosFlushDirtyPages(ULONG Target, PULONG Count)
{
ExReleasePushLock(&current->Lock);
ExReleaseResourceLite(((FSRTL_COMMON_FCB_HEADER*)(current->Bcb->FileObject->FsContext))->Resource);
ObDereferenceObject(current->Bcb->FileObject);
continue;
}
@@ -267,6 +275,7 @@ CcRosFlushDirtyPages(ULONG Target, PULONG Count)
ExReleasePushLock(&current->Lock);
ExReleaseResourceLite(((FSRTL_COMMON_FCB_HEADER*)(current->Bcb->FileObject->FsContext))->Resource);
ObDereferenceObject(current->Bcb->FileObject);
if (!NT_SUCCESS(Status) && (Status != STATUS_END_OF_FILE))
{