IPRT/memobj-r0drv-os2.cpp: Implemented sub-mappings in kernel space. bugref:9218

git-svn-id: https://www.virtualbox.org/svn/vbox/trunk@81620 cfe28804-0f27-0410-a406-dd0f0b0b656f

1 files changed, 3 insertions, 3 deletions

diff --git a/src/VBox/Runtime/r0drv/os2/memobj-r0drv-os2.cpp b/src/VBox/Runtime/r0drv/os2/memobj-r0drv-os2.cpp
index 1441b269b49..9780fbb40ea 100644
--- a/src/VBox/Runtime/r0drv/os2/memobj-r0drv-os2.cpp
+++ b/src/VBox/Runtime/r0drv/os2/memobj-r0drv-os2.cpp
@@ -348,7 +348,6 @@ DECLHIDDEN(int) rtR0MemObjNativeReserveUser(PPRTR0MEMOBJINTERNAL ppMem, RTR3PTR
 DECLHIDDEN(int) rtR0MemObjNativeMapKernel(PPRTR0MEMOBJINTERNAL ppMem, RTR0MEMOBJ pMemToMap, void *pvFixed, size_t uAlignment,
                                           unsigned fProt, size_t offSub, size_t cbSub)
 {
-    AssertMsgReturn(!offSub && !cbSub, ("%#x %#x\n", offSub, cbSub), VERR_NOT_SUPPORTED);
     AssertMsgReturn(pvFixed == (void *)-1, ("%p\n", pvFixed), VERR_NOT_SUPPORTED);
 
     /*
@@ -357,7 +356,6 @@ DECLHIDDEN(int) rtR0MemObjNativeMapKernel(PPRTR0MEMOBJINTERNAL ppMem, RTR0MEMOBJ
     if (uAlignment > PAGE_SIZE)
         return VERR_NOT_SUPPORTED;
 
-
 /** @todo finish the implementation. */
 
     int rc;
@@ -415,8 +413,10 @@ DECLHIDDEN(int) rtR0MemObjNativeMapKernel(PPRTR0MEMOBJINTERNAL ppMem, RTR0MEMOBJ
      * isn't actually freed until all the mappings have been freed up
      * (reference counting).
      */
+    if (!cbSub)
+        cbSub = pMemToMapOs2->Core.cb - offSub;
     PRTR0MEMOBJOS2 pMemOs2 = (PRTR0MEMOBJOS2)rtR0MemObjNew(RT_UOFFSETOF(RTR0MEMOBJOS2, Lock), RTR0MEMOBJTYPE_MAPPING,
-                                                           pvR0, pMemToMapOs2->Core.cb);
+                                                           (uint8_t *)pvR0 + offSub, cbSub);
     if (pMemOs2)
     {
         pMemOs2->Core.u.Mapping.R0Process = NIL_RTR0PROCESS;