scratch_buffer: use union for internal buffer

Problem reported by Florian Weimer [1] and solution suggested by
Andreas Schwab [2].  It also set the same buffer size independent
of architecture max_align_t size.

Checked on x86_64-linux-gnu and i686-linux-gnu.

	* lib/malloc/scratch_buffer.h (struct scratch_buffer):
	Use an union instead of a max_align_t array for __space,
	so that __space is the same size on all platforms.
	* malloc/scratch_buffer_grow_preserve.c
	(__libc_scratch_buffer_grow_preserve): Likewise.

[1] https://sourceware.org/ml/libc-alpha/2017-09/msg00693.html
[2] https://sourceware.org/ml/libc-alpha/2017-09/msg00695.html

1 files changed, 2 insertions, 2 deletions

diff --git a/malloc/scratch_buffer_grow_preserve.c b/malloc/scratch_buffer_grow_preserve.c
index 9268615311..59a922b8a9 100644
--- a/malloc/scratch_buffer_grow_preserve.c
+++ b/malloc/scratch_buffer_grow_preserve.c
@@ -30,14 +30,14 @@ __libc_scratch_buffer_grow_preserve (struct scratch_buffer *buffer)
   size_t new_length = 2 * buffer->length;
   void *new_ptr;
 
-  if (buffer->data == buffer->__space)
+  if (buffer->data == buffer->__space.__c)
     {
       /* Move buffer to the heap.  No overflow is possible because
 	 buffer->length describes a small buffer on the stack.  */
       new_ptr = malloc (new_length);
       if (new_ptr == NULL)
 	return false;
-      memcpy (new_ptr, buffer->__space, buffer->length);
+      memcpy (new_ptr, buffer->__space.__c, buffer->length);
     }
   else
     {