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[MOUNTMGR] Fix QueryPointsFromSymbolicLinkName and make it working

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Select the current stack location for output buffer
And set output size so that buffer gets properly copied to caller
This commit is contained in:
Pierre Schweitzer 2019-09-06 08:28:36 +02:00
parent 16ec2e2aa5
commit 26a31b160a
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GPG key ID: 7545556C3D585B0B
1 changed files with 4 additions and 1 deletions
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5
drivers/filters/mountmgr/point.c
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@ -518,7 +518,7 @@ QueryPointsFromSymbolicLinkName(IN PDEVICE_EXTENSION DeviceExtension,
}
/* Get output buffer */
Stack = IoGetNextIrpStackLocation(Irp);
Stack = IoGetCurrentIrpStackLocation(Irp);
MountPoints = (PMOUNTMGR_MOUNT_POINTS)Irp->AssociatedIrp.SystemBuffer;
/* Compute output length */
@ -528,9 +528,12 @@ QueryPointsFromSymbolicLinkName(IN PDEVICE_EXTENSION DeviceExtension,
/* Give length to allow reallocation */
MountPoints->Size = sizeof(MOUNTMGR_MOUNT_POINTS) + TotalLength;
MountPoints->NumberOfMountPoints = 1;
Irp->IoStatus.Information = sizeof(MOUNTMGR_MOUNT_POINTS) + TotalLength;
if (MountPoints->Size > Stack->Parameters.DeviceIoControl.OutputBufferLength)
{
Irp->IoStatus.Information = sizeof(MOUNTMGR_MOUNT_POINTS);
return STATUS_BUFFER_OVERFLOW;
}