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-rw-r--r--misc/sbrk.c10
1 files changed, 7 insertions, 3 deletions
diff --git a/misc/sbrk.c b/misc/sbrk.c
index 0df60076cc..985b34749a 100644
--- a/misc/sbrk.c
+++ b/misc/sbrk.c
@@ -1,4 +1,4 @@
-/* Copyright (C) 1991,1995,1996,1997,2000,2002 Free Software Foundation, Inc.
+/* Copyright (C) 1991,1995-1997,2000,2002,2009 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -16,8 +16,9 @@
    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
    02111-1307 USA.  */
 
-#include <unistd.h>
 #include <errno.h>
+#include <stdint.h>
+#include <unistd.h>
 
 /* Defined in brk.c.  */
 extern void *__curbrk;
@@ -47,7 +48,10 @@ __sbrk (intptr_t increment)
     return __curbrk;
 
   oldbrk = __curbrk;
-  if (__brk (oldbrk + increment) < 0)
+  if ((increment > 0
+       ? ((uintptr_t) oldbrk + (uintptr_t) increment < (uintptr_t) oldbrk)
+       : ((uintptr_t) oldbrk < (uintptr_t) -increment))
+      || __brk (oldbrk + increment) < 0)
     return (void *) -1;
 
   return oldbrk;