From 796f8789f80568861b747265998f31fa83091915 Mon Sep 17 00:00:00 2001
From: Samuel Thibault <samuel.thibault@ens-lyon.org>
Date: Mon, 11 Sep 2017 00:48:17 +0200
Subject: storeio: Avoid calling mmap with zero size

* storeio/dev.c (dev_open): When store is zero-sized, set buf to NULL
instead of calling mmap().
---
 storeio/dev.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

(limited to 'storeio')

diff --git a/storeio/dev.c b/storeio/dev.c
index 78e0a177..8bdfa111 100644
--- a/storeio/dev.c
+++ b/storeio/dev.c
@@ -161,8 +161,11 @@ dev_open (struct dev *dev)
      to support this.  */
   store_set_flags (dev->store, STORE_INACTIVE);
 
-  dev->buf = mmap (0, dev->store->block_size, PROT_READ|PROT_WRITE,
-		   MAP_ANON, 0, 0);
+  if (! dev->store->block_size)
+    dev->buf = NULL;
+  else
+    dev->buf = mmap (0, dev->store->block_size, PROT_READ|PROT_WRITE,
+		     MAP_ANON, 0, 0);
   if (dev->buf == MAP_FAILED)
     {
       store_free (dev->store);
-- 
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