Kernel/MMap - Fix off-by-one error causing junk mappings

diff --git a/KernelLand/Kernel/vfs/mmap.c b/KernelLand/Kernel/vfs/mmap.c
index 591ae28..b6d5c2d 100644 (file)
--- a/KernelLand/Kernel/vfs/mmap.c
+++ b/KernelLand/Kernel/vfs/mmap.c
@@ -71,7 +71,7 @@ void *VFS_MMap(void *DestHint, size_t Length, int Protection, int Flags, int FD,
        // - Sorted list of 16 page blocks
        for(
                pb = h->Node->MMapInfo, prev = NULL;
-               pb && pb->BaseOffset + MMAP_PAGES_PER_BLOCK < pagenum;
+               pb && pb->BaseOffset + MMAP_PAGES_PER_BLOCK <= pagenum;
                prev = pb, pb = pb->Next
                )
                ;
@@ -98,6 +98,8 @@ void *VFS_MMap(void *DestHint, size_t Length, int Protection, int Flags, int FD,
        // - Map (and allocate) pages
        while( npages -- )
        {
+               assert( pagenum >= pb->BaseOffset );
+               assert( pagenum - pb->BaseOffset < MMAP_PAGES_PER_BLOCK );
                if( MM_GetPhysAddr( mapping_dest ) == 0 )
                {
                        if( pb->PhysAddrs[pagenum - pb->BaseOffset] == 0 )