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authorUlrich Drepper <drepper@redhat.com>2009-01-30 17:47:23 +0000
committerUlrich Drepper <drepper@redhat.com>2009-01-30 17:47:23 +0000
commit1fdd89a78dfa4f0ea4b14c994a055de802e61a89 (patch)
treefb50205adf4fe547c4056a9d4731ef6a1170135f /misc/sbrk.c
parent8585cb7454e10346bccc9fb4df3fae51b2efb9b6 (diff)
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* malloc/malloc.c (sYSMALLOc): Don't use assert when detecting
manipulated brk, use malloc_printerr. * misc/sbrk.c (__sbrk): Better error handling for nonsense requests.
Diffstat (limited to 'misc/sbrk.c')
-rw-r--r--misc/sbrk.c10
1 files changed, 7 insertions, 3 deletions
diff --git a/misc/sbrk.c b/misc/sbrk.c
index 0df6007..985b347 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;