[reactos] 01/02: [MOUNTMGR] Fix QueryPointsFromSymbolicLinkName and make it working

[Pierre Schweitzer]

https://git.reactos.org/?p=reactos.git;a=commitdiff;h=26a31b160ab3db16bf92cc...

commit 26a31b160ab3db16bf92cc786e9d5ecf080057fe
Author:     Pierre Schweitzer [e-mail]
AuthorDate: Fri Sep 6 08:28:36 2019 +0200
Commit:     Pierre Schweitzer [e-mail]
CommitDate: Fri Sep 6 08:28:36 2019 +0200

[MOUNTMGR] Fix QueryPointsFromSymbolicLinkName and make it working

Select the current stack location for output buffer
    And set output size so that buffer gets properly copied to caller
---
 drivers/filters/mountmgr/point.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/filters/mountmgr/point.c b/drivers/filters/mountmgr/point.c
index d63ec3a4592..77fc6fba95f 100644
--- a/drivers/filters/mountmgr/point.c
+++ b/drivers/filters/mountmgr/point.c
@@ -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;
     }