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[FASTFAT] Lock DirResource when modifying an entry on disk.

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Likely not optimal, but fixes some races conditions where
the directory is uninit in the middle of the write.
This commit is contained in:
Pierre Schweitzer 2018-05-26 17:12:03 +02:00
parent cca1a3f47f
commit fc788cf2fd
No known key found for this signature in database
GPG key ID: 7545556C3D585B0B
1 changed files with 11 additions and 3 deletions
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14
drivers/filesystems/fastfat/finfo.c
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@ -1552,6 +1552,7 @@ VfatSetInformation(
PVFATFCB FCB;
NTSTATUS Status = STATUS_SUCCESS;
PVOID SystemBuffer;
BOOLEAN LockDir;
/* PRECONDITION */
ASSERT(IrpContext);
@ -1593,7 +1594,14 @@ VfatSetInformation(
DPRINT("Can set file size\n");
}
if (FileInformationClass == FileRenameInformation)
LockDir = FALSE;
if (FileInformationClass == FileRenameInformation || FileInformationClass == FileAllocationInformation ||
FileInformationClass == FileEndOfFileInformation || FileInformationClass == FileBasicInformation)
{
LockDir = TRUE;
}
if (LockDir)
{
if (!ExAcquireResourceExclusiveLite(&((PDEVICE_EXTENSION)IrpContext->DeviceObject->DeviceExtension)->DirResource,
BooleanFlagOn(IrpContext->Flags, IRPCONTEXT_CANWAIT)))
@ -1607,7 +1615,7 @@ VfatSetInformation(
if (!ExAcquireResourceExclusiveLite(&FCB->MainResource,
BooleanFlagOn(IrpContext->Flags, IRPCONTEXT_CANWAIT)))
{
if (FileInformationClass == FileRenameInformation)
if (LockDir)
{
ExReleaseResourceLite(&((PDEVICE_EXTENSION)IrpContext->DeviceObject->DeviceExtension)->DirResource);
}
@ -1662,7 +1670,7 @@ VfatSetInformation(
ExReleaseResourceLite(&FCB->MainResource);
}
if (FileInformationClass == FileRenameInformation)
if (LockDir)
{
ExReleaseResourceLite(&((PDEVICE_EXTENSION)IrpContext->DeviceObject->DeviceExtension)->DirResource);
}