1  /* PR middle-end/104069 - -Werror=use-after-free false positive on
       2     elfutils-0.186
       3     { dg-do compile }
       4     { dg-options "-Wall" } */
       5  
       6  typedef __SIZE_TYPE__ size_t;
       7  
       8  extern void* realloc (void *, size_t);
       9  
      10  void* __libdw_unzstd (size_t todo)
      11  {
      12    void *sb = 0;
      13  
      14    for ( ; ; )
      15      {
      16        // Ran only once.
      17        if (!sb)
      18  	{
      19  	  char *b = realloc (sb, todo);
      20  	  if (!b)
      21  	    break;
      22  
      23  	  sb = b;
      24  	}
      25  
      26        todo -= 1;
      27        if (todo == 0)
      28  	break;
      29      }
      30  
      31    // Shrink buffer: leave only one byte for simplicity.
      32    char *b = realloc (sb, 1);
      33    if (b)
      34      sb = b;
      35    else
      36      {
      37        // Realloc failed mysteriously, leave 'sb' untouched.
      38      }
      39  
      40    return sb;        // { dg-bogus "-Wuse-after-free" }
      41  }