http://sourceware.org/bugzilla/show_bug.cgi?id=3352

Index: libc/elf/dl-minimal.c
===================================================================
RCS file: /cvs/glibc/libc/elf/dl-minimal.c,v
retrieving revision 1.48.2.2
retrieving revision 1.48.2.3
diff -u -r1.48.2.2 -r1.48.2.3
--- libc/elf/dl-minimal.c	19 Dec 2005 12:11:14 -0000	1.48.2.2
+++ libc/elf/dl-minimal.c	25 Oct 2006 19:13:35 -0000	1.48.2.3
@@ -1,5 +1,6 @@
 /* Minimal replacements for basic facilities used in the dynamic linker.
-   Copyright (C) 1995-1998,2000-2002,2004,2005 Free Software Foundation, Inc.
+   Copyright (C) 1995-1998,2000-2002,2004,2005,2006
+   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
@@ -128,14 +129,13 @@
 void * weak_function
 realloc (void *ptr, size_t n)
 {
-  void *new;
   if (ptr == NULL)
     return malloc (n);
   assert (ptr == alloc_last_block);
+  size_t old_size = alloc_ptr - alloc_last_block;
   alloc_ptr = alloc_last_block;
-  new = malloc (n);
-  assert (new == ptr);
-  return new;
+  void *new = malloc (n);
+  return new != ptr ? memcpy (new, ptr, old_size) : new;
 }

 /* Avoid signal frobnication in setjmp/longjmp.  Keeps things smaller.  */