From 1fd368d36024b2bbacde376b258b0d33648ff538 Mon Sep 17 00:00:00 2001
From: Georg Reinke <georg.reinke@rwth-aachen.de>
Date: Tue, 28 Mar 2017 12:52:21 +0200
Subject: [PATCH] fix possible underflow in memory manager

---
 lib/memory.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/memory.c b/lib/memory.c
index 1e7f10e65..1cde4c9ae 100644
--- a/lib/memory.c
+++ b/lib/memory.c
@@ -120,6 +120,9 @@ void* memory_managed_alloc(struct memtype *m, size_t len, size_t alignment)
         uintptr_t gap = 0;
         if (rem != 0) {
             gap = alignment - rem;
+            if (gap > avail)
+                // next aligned address isn't in this block anymore
+                continue;
             cptr += gap;
             avail -= gap;
         }