[Bug stdio/18820] New: fmemopen may leak memory on failure

["ppluzhnikov at google dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=18820

            Bug ID: 18820
           Summary: fmemopen may leak memory on failure
           Product: glibc
           Version: unspecified
            Status: NEW
          Severity: normal
          Priority: P2
         Component: stdio
          Assignee: unassigned at sourceware dot org
          Reporter: ppluzhnikov at google dot com
  Target Milestone: ---

While fixing PR 18757, I noticed that fmemopen leaks memory via the following
path:

FILE *
__fmemopen (void *buf, size_t len, const char *mode)
{
  cookie_io_functions_t iof;
  fmemopen_cookie_t *c;

  c = (fmemopen_cookie_t *) calloc (sizeof (fmemopen_cookie_t), 1);
  ...

  return _IO_fopencookie (c, mode, iof);
}

If _IO_fopencookie() fails and returns NULL, we leak.

The fix for both issues was here:
https://sourceware.org/ml/libc-alpha/2015-08/msg00315.html
but it needs more work.

I might as well separate the issues.

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