[rtems commit] score: Fix for empty heap

[Sebastian Huber]

Module:    rtems
Branch:    master
Commit:    d61c315575a45ec4e539d9b7511895b310917e77
Changeset: http://git.rtems.org/rtems/commit/?id=d61c315575a45ec4e539d9b7511895b310917e77

Author:    Sebastian Huber <sebastian.huber at embedded-brains.de>
Date:      Mon Apr  7 16:00:00 2014 +0200

score: Fix for empty heap

---

 cpukit/score/src/heapgreedy.c |    7 ++++++-
 1 files changed, 6 insertions(+), 1 deletions(-)

diff --git a/cpukit/score/src/heapgreedy.c b/cpukit/score/src/heapgreedy.c
index 34ac811..615d306 100644
--- a/cpukit/score/src/heapgreedy.c
+++ b/cpukit/score/src/heapgreedy.c
@@ -83,7 +83,12 @@ Heap_Block *_Heap_Greedy_allocate_all_except_largest(
   Heap_Information info;
 
   _Heap_Get_free_information( heap, &info );
-  *allocatable_size = info.largest - HEAP_BLOCK_HEADER_SIZE + HEAP_ALLOC_BONUS;
+
+  if ( info.largest > 0 ) {
+    *allocatable_size = info.largest - HEAP_BLOCK_HEADER_SIZE + HEAP_ALLOC_BONUS;
+  } else {
+    *allocatable_size = 0;
+  }
 
   return _Heap_Greedy_allocate( heap, allocatable_size, 1 );
 }