[Bug libc/23654] Memory leak in gconv_cache.c

["fweimer at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=23654

Florian Weimer <fweimer at redhat dot com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |fweimer at redhat dot com

--- Comment #1 from Florian Weimer <fweimer at redhat dot com> ---
Hmm.  valgrind says about this:

==2992== 208 bytes in 1 blocks are definitely lost in loss record 1 of 2
==2992==    at 0x4C2CB6B: malloc (vg_replace_malloc.c:299)
==2992==    by 0x4E62E9C: __gconv_lookup_cache (gconv_cache.c:371)
==2992==    by 0x4E5BDC1: __gconv_find_transform (gconv_db.c:743)
==2992==    by 0x4EE69E9: __wcsmbs_getfct (wcsmbsload.c:91)
==2992==    by 0x4EE6D3B: __wcsmbs_named_conv (wcsmbsload.c:242)
==2992==    by 0x4EB2B4E: _IO_file_fopen@@GLIBC_2.2.5 (fileops.c:361)
==2992==    by 0x4EA6373: __fopen_internal (iofopen.c:86)
==2992==    by 0x400708: main (fopen-ccs.c:19)
==2992== 
==2992== 208 bytes in 1 blocks are definitely lost in loss record 2 of 2
==2992==    at 0x4C2CB6B: malloc (vg_replace_malloc.c:299)
==2992==    by 0x4E62D6D: __gconv_lookup_cache (gconv_cache.c:371)
==2992==    by 0x4E5BDC1: __gconv_find_transform (gconv_db.c:743)
==2992==    by 0x4EE69E9: __wcsmbs_getfct (wcsmbsload.c:91)
==2992==    by 0x4EE6D5E: __wcsmbs_named_conv (wcsmbsload.c:246)
==2992==    by 0x4EB2B4E: _IO_file_fopen@@GLIBC_2.2.5 (fileops.c:361)
==2992==    by 0x4EA6373: __fopen_internal (iofopen.c:86)
==2992==    by 0x400708: main (fopen-ccs.c:19)

This is with:

#include <err.h>
#include <stdio.h>
#include <stdlib.h>
#include <wchar.h>

int
main (int argc, char **argv)
{
  if (argc != 3)
    errx (1, "usage: %s PATH CODESET", argv[0]);
  const char *path = argv[1];
  const char *codeset = argv[2];

  FILE *fp;
  {
    char *mode;
    if (asprintf (&mode, "r,ccs=%s", codeset) < 0)
      err (1, "asprintf");
    fp = fopen (path, mode);
    if (fp == NULL)
      err (1, "fopen");
    free (mode);
  }

  wint_t ch = fgetwc (fp);
  if (feof (fp))
    puts ("file is empty");
  else if (ferror (fp))
    err (1, "fgetwc");
  else
    printf ("character: 0x%x\n", (int) ch);
  fclose (fp);
  return 0;
}

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