Alexandre Julliard : ntdll: Report the remaining part of the 64K after a view as free.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: 78ffde79fe5fe8bbd782bd03590e2ebeff6759c3
URL:    https://gitlab.winehq.org/wine/wine/-/commit/78ffde79fe5fe8bbd782bd03590e2eb...

Author: Alexandre Julliard 
Date:   Thu Jun  8 13:21:10 2023 +0200

ntdll: Report the remaining part of the 64K after a view as free.

To avoid returning non-aligned reserved regions.

---

dlls/ntdll/unix/virtual.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/dlls/ntdll/unix/virtual.c b/dlls/ntdll/unix/virtual.c
index 5dd03c6cc85..167203301f1 100644
--- a/dlls/ntdll/unix/virtual.c
+++ b/dlls/ntdll/unix/virtual.c
@@ -4638,6 +4638,18 @@ static unsigned int fill_basic_memory_info( const void *addr, MEMORY_BASIC_INFOR
                     if (area_end < alloc_end) info->RegionSize = area_end - base;
                     break;
                 }
+                /* report the remaining part of the 64K after the view as free */
+                if ((UINT_PTR)alloc_base & granularity_mask)
+                {
+                    char *next = (char *)ROUND_ADDR( alloc_base, granularity_mask ) + granularity_mask + 1;
+
+                    if (base < next)
+                    {
+                        info->RegionSize = min( next, alloc_end ) - base;
+                        break;
+                    }
+                    else alloc_base = base;
+                }
                 /* pretend it's allocated */
                 if (area_start < alloc_end) info->RegionSize = area_start - base;
                 info->State             = MEM_RESERVE;