From 93d2b3c4e8ccbb580a04f86eee6f66ea538afb28 Mon Sep 17 00:00:00 2001
From: Sergey Bugaev <bugaevc@gmail.com>
Date: Fri, 7 May 2021 12:26:39 +0300
Subject: libpager: Properly zero-initialize pagemap

Unlike mmap () and calloc (), reallocarray () does not automatically
zero-fill the newly allocated memory. Do so explicitly.
Message-Id: <CAN9u=Hd21Es7Kc4tVBAUeLaKo9CWKO1e577TqnXMzmmvwLi22Q@mail.gmail.com>
---
 libpager/pagemap.c | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'libpager/pagemap.c')

diff --git a/libpager/pagemap.c b/libpager/pagemap.c
index 7bbb8c56..c7c86d60 100644
--- a/libpager/pagemap.c
+++ b/libpager/pagemap.c
@@ -32,6 +32,8 @@ _pager_pagemap_resize (struct pager *p, vm_address_t off)
       if (!newaddr)
         return errno;
 
+      memset ((short *) newaddr + p->pagemapsize, 0,
+              (off - p->pagemapsize) * sizeof (*p->pagemap));
       p->pagemap = newaddr;
       p->pagemapsize = off;
     }
-- 
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