grub2/0331-grub-core-kern-mm.c-grub_mm_init_region-Fix-conditio.patch

From 761e63a2a5f38419acd0e54d6b54845e65a152dc Mon Sep 17 00:00:00 2001
From: Vladimir 'phcoder' Serbinenko <phcoder@gmail.com>
Date: Sat, 20 Apr 2013 17:39:49 +0200
Subject: [PATCH 331/364] 	* grub-core/kern/mm.c (grub_mm_init_region):
 Fix condition for 	detecting too small regions.

---
 ChangeLog           | 5 +++++
 grub-core/kern/mm.c | 5 +++--
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/ChangeLog b/ChangeLog
index b2e3ccc..2a4264c 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,10 @@
 2013-04-20  Vladimir Serbinenko  <phcoder@gmail.com>
 
+	* grub-core/kern/mm.c (grub_mm_init_region): Fix condition for
+	detecting too small regions.
+
+2013-04-20  Vladimir Serbinenko  <phcoder@gmail.com>
+
 	* grub-core/Makefile.core.def (legacycfg): Enable on EFI.
 
 2013-04-20  Vladimir Serbinenko  <phcoder@gmail.com>
diff --git a/grub-core/kern/mm.c b/grub-core/kern/mm.c
index d869091..959c3ba 100644
--- a/grub-core/kern/mm.c
+++ b/grub-core/kern/mm.c
@@ -140,12 +140,13 @@ grub_mm_init_region (void *addr, grub_size_t size)
 
   /* Allocate a region from the head.  */
   r = (grub_mm_region_t) ALIGN_UP ((grub_addr_t) addr, GRUB_MM_ALIGN);
-  size -= (char *) r - (char *) addr + sizeof (*r);
 
   /* If this region is too small, ignore it.  */
-  if (size < GRUB_MM_ALIGN)
+  if (size < GRUB_MM_ALIGN + (char *) r - (char *) addr + sizeof (*r))
     return;
 
+  size -= (char *) r - (char *) addr + sizeof (*r);
+
   h = (grub_mm_header_t) (r + 1);
   h->next = h;
   h->magic = GRUB_MM_FREE_MAGIC;
-- 
1.8.1.4