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From: "wangxuszcn at foxmail dot com" <sourceware-bugzilla@sourceware.org>
To: glibc-bugs@sourceware.org
Subject: [Bug dynamic-link/28395] result.val is aligned  malloc pointer, may
 not be check NULL in allocate_and_init()
Date: Thu, 30 Sep 2021 04:25:41 +0000
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https://sourceware.org/bugzilla/show_bug.cgi?id=3D28395

--- Comment #2 from wangxu <wangxuszcn at foxmail dot com> ---
(In reply to Andreas Schwab from comment #1)
> When does this make a difference?

Original pointer of buffer allocated in allocate_dtv_entry() is assigned to
.to_free, while .val is aligned pointer of buffer.

/* Allocate one DTV entry.  */
static struct dtv_pointer allocate_dtv_entry (size_t alignment, size_t size)
{

  ......
  void *start =3D malloc (alloc_size);
  /* Find the aligned position within the larger allocation.  */
  void *aligned =3D (void *) roundup ((uintptr_t) start, alignment);

  return (struct dtv_pointer) { .val =3D aligned, .to_free =3D start };
}

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