[PATCH 5/6] libpager: Fix overallocating pagemap

[Sergey Bugaev]

The code tried to round up the allocation size to a multiple of page size.
But we actually allocate newsize * sizeof (*p->pagemap) bytes, not newsize
bytes, which meant allocations were sizeof (*p->pagemap) times larger than
they needed to be.
---
 libpager/pagemap.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/libpager/pagemap.c b/libpager/pagemap.c
index 63c5f44d..1570c75b 100644
--- a/libpager/pagemap.c
+++ b/libpager/pagemap.c
@@ -17,21 +17,22 @@
 
 #include "priv.h"
 #include <string.h>
-  
+
 /* Grow the pagemap of pager P as necessary to deal with address OFF */
 error_t
 _pager_pagemap_resize (struct pager *p, vm_address_t off)
 {
   error_t err = 0;
-  
+
   off /= __vm_page_size;
 
   if (p->pagemapsize < off)
     {
       void *newaddr;
-      vm_size_t newsize = round_page (off);
+      vm_size_t newsize = round_page (off * sizeof (*p->pagemap))
+                                          / sizeof (*p->pagemap);
 
-      newaddr = mmap (0, newsize * sizeof (*p->pagemap), 
+      newaddr = mmap (0, newsize * sizeof (*p->pagemap),
                      PROT_READ|PROT_WRITE, MAP_ANON, 0, 0);
       err = (newaddr == (void *) -1) ? errno : 0;
       if (! err)
-- 
2.31.1