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ra-serf bug

From: Eric Gillespie <epg_at_pretzelnet.org>
Date: Thu, 08 May 2008 18:05:57 -0700

It's been a long time since I made the vague claim "serf breaks
the Python binding"; today I finally decided to try to narrow it
down. I have a tiny little C program that demonstrates the problem:

0 svn% ./serfbug svn://svn/r 84
fetched 118171
# neon
0 svn% ./serfbug https://svn/r 84
fetched 118171
# serf
0 svn% ./serfbug https://svn/r 84
subversion/libsvn_ra_serf/util.c:551: (apr_err=20014)
foo: Error running context: Internal error
*** glibc detected *** double free or corruption (!prev):
0x08098f68 ***
zsh: abort (core dumped) ./serfbug https://svn/r 84

This happens with both 1.5.x and trunk, fresh as of 5 minutes ago
(r31106). The error (but not the double free) goes away if you
pass revision instead of SVN_INVALID_REVNUM.

#include <errno.h>
#include <stdio.h>
#include <stdlib.h>

/* for svn initialization */
#include <apr_errno.h>
#include <apr_general.h>
#include <apr_strings.h>
#include <svn_auth.h>
#include <svn_cmdline.h>
#include <svn_config.h>
#include <svn_dso.h>
#include <svn_nls.h>
#include <svn_pools.h>
/* for svn_ra_get_dir2 */
#include <apr_hash.h>
#include <svn_error.h>
#include <svn_io.h>
#include <svn_path.h>
#include <svn_ra.h>

static svn_error_t *
open_tmp_file(apr_file_t **fp, void *baton, apr_pool_t *pool)
{
  const char *base_fn, *base_path, *fn;
  SVN_ERR(svn_io_temp_dir(&base_fn, pool));
  base_path = svn_path_join(base_fn, "foo", pool);
  return svn_io_open_unique_file2(fp, &fn, base_path, ".tmp",
                                  svn_io_file_del_on_close, pool);
}

#define ERR(expr) \
  do { \
    svn_error_t *err = (expr); \
    if (err) { \
      fprintf(stderr, "%s:%ld: (apr_err=%d)\nfoo: %s\n", \
              err->file, err->line, err->apr_err, \
              err->message); \
      return 1; \
    } \
  } while (0)

int
main(int argc, char *argv[])
{
  apr_pool_t *pool;
  apr_hash_t *cfg_hash;
  long revision;
  svn_ra_callbacks2_t *callbacks;

  if (argc < 3 || (argv[1] && argv[1][0] == '-')) {
    fputs("usage: foo URL REVISION\n", stderr);
    if (argv[1] && argv[1][0] == '-') {
      return 0;
    }
    return 2;
  }

  errno = 0;
  revision = strtol(argv[2], NULL, 10);
  if (errno != 0) {
    fprintf(stderr, "foo: strtol(%s): ", argv[2]);
    perror("");
    return 3;
  }

  /* Initialize svn. */
  {
    apr_status_t apr_status;
    char buf[1024];

    if ((apr_status = apr_initialize()) != APR_SUCCESS) {
      apr_strerror(apr_status, buf, sizeof(buf) - 1);
      fprintf(stderr, "foo: cannot initialize APR: %s\n", buf);
      return 1;
    }

    svn_dso_initialize();

    if (atexit(apr_terminate) != 0) {
      fputs("atexit registration failed\n", stderr);
      return 1;
    }

    pool = svn_pool_create(NULL);
    svn_utf_initialize(pool);
    ERR(svn_nls_init());

    ERR(svn_config_get_config(&cfg_hash, NULL, pool));

    ERR(svn_ra_initialize(pool));

    ERR(svn_ra_create_callbacks(&callbacks, pool));
    callbacks->open_tmp_file = open_tmp_file;
    ERR(svn_cmdline_setup_auth_baton(&(callbacks->auth_baton),
                                     TRUE, /* non_interactive */
                                     NULL, /* username */
                                     NULL, /* password */
                                     NULL, /* config_dir */
                                     FALSE, /* no_auth_cache */
                                     apr_hash_get(cfg_hash,
                                                  SVN_CONFIG_CATEGORY_CONFIG,
                                                  APR_HASH_KEY_STRING),
                                     NULL, /* cancel_func */
                                     NULL, /* cancel_baton */
                                     pool));
  }

  /* Try something simple enough. */
  {
    svn_ra_session_t *ra;
    apr_hash_t *dirents;
    svn_revnum_t fetched_rev;
    apr_hash_t *props;
    ERR(svn_ra_open2(&ra, argv[1], callbacks, NULL, cfg_hash, pool));
    ERR(svn_ra_get_dir2(ra, &dirents, &fetched_rev, &props,
                        "", /* path */
                        SVN_INVALID_REVNUM, /* revision */
                        0, /* dirent_fields */
                        pool));
    printf("fetched %ld\n", fetched_rev);
  }

  return 0;
}

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Received on 2008-05-09 03:06:42 CEST

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