Power-Programmierung/CD2.mdf/c/library/os2/rcs/rcs56src/source/gdbm/gdbm.bug

Internet Message Format | 1992-01-18 | 5.9 KB

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Subject: gdbm-1.5 gdbm_reorganize() does not free memory
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Date: 5 Apr 91 20:12:47 GMT
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The gdbm_reorganize routine of gdbm-1.5 does not free content.dptr which
can seriously increase the size of the program's memory-usage.

A free(content.dptr) just before or after the free(key.dptr) should fix
this.

Martin
--
Martin Schulte
Institute for Theoretical Physics
University of Cologne/Germany

Internet: [e-mail]


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From: [e-mail] (Phil Male)
Subject: gdbm-1.5
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Date: Sun, 5 Jan 1992 14:08:51 GMT
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These are the patches to gdbm-1.5 gdbmreorg.c I had to apply to fix the memory
leaks and to stop the file descriptor walking as a function of the reorganise
(this is a feature that was causing problems for an application sitting above
gdbm - seemed like a good idea to include these patches).
These patches include the previous patch I posted to stop incorrect assignment
of the cache_entry pointer.

--- cut here
*** gdbmreorg.c.old    Thu Jan  2 03:37:18 1992
--- gdbmreorg.c    Sun Jan  5 13:00:47 1992
***************
*** 74,79 ****
--- 74,80 ----
    gdbm_file_info *new_dbf;        /* The new file. */
    char *new_name;            /* A temporary name. */
    int  len;                /* Used in new_name construction. */
+   int new_desc;                /* Used to avoid walking file desc */
    datum key, nextkey, data;        /* For the sequential sweep. */
    struct stat fileinfo;            /* Information about the file. */
    int  index;                /* Use in moving the bucket cache. */
***************
*** 131,138 ****
            gdbm_close (new_dbf);
            gdbm_errno = GDBM_REORGANIZE_FAILED;
            unlink (new_name);
            return -1;
!         };
       }
        else
       {
--- 132,140 ----
            gdbm_close (new_dbf);
            gdbm_errno = GDBM_REORGANIZE_FAILED;
            unlink (new_name);
+           free(new_name);
            return -1;
!         }
       }
        else
       {
***************
*** 140,145 ****
--- 142,148 ----
        gdbm_close (new_dbf);
        gdbm_errno = GDBM_REORGANIZE_FAILED;
        unlink (new_name);
+       free(new_name);
        return -1;
       }
        nextkey = gdbm_nextkey (dbf, key);
***************
*** 153,164 ****
      {
        gdbm_errno = GDBM_REORGANIZE_FAILED;
        gdbm_close (new_dbf);
        return -1;
      }

    /* Fix up DBF to have the correct information for the new file. */
    UNLOCK_FILE(dbf);
!   close (dbf->desc);
    free (dbf->header);
    free (dbf->dir);
    for (index = 0; index < CACHE_SIZE; index++)
--- 156,178 ----
      {
        gdbm_errno = GDBM_REORGANIZE_FAILED;
        gdbm_close (new_dbf);
+       unlink (new_name);
+       free(new_name);
        return -1;
      }

    /* Fix up DBF to have the correct information for the new file. */
    UNLOCK_FILE(dbf);
!   /* close (dbf->desc); */
!   if ((new_desc = dup2(new_dbf->desc, dbf->desc)) < 0)
!     {
!       gdbm_close(new_dbf);
!       gdbm_errno = GDBM_REORGANIZE_FAILED;
!       unlink (new_name);
!       free(new_name);
!       return -1;
!     }
!   dbf->desc = new_desc;
    free (dbf->header);
    free (dbf->dir);
    for (index = 0; index < CACHE_SIZE; index++)
***************
*** 169,180 ****
      free (dbf->bucket_cache[index].ca_data.dptr);
      }

!   dbf->desc           = new_dbf->desc;
    dbf->header         = new_dbf->header;
    dbf->dir            = new_dbf->dir;
    dbf->bucket         = new_dbf->bucket;
    dbf->bucket_dir     = new_dbf->bucket_dir;
!   dbf->cache_entry    = new_dbf->cache_entry;
    dbf->last_read      = new_dbf->last_read;
    for (index = 0; index < CACHE_SIZE; index++)
      dbf->bucket_cache[index] = new_dbf->bucket_cache[index];
--- 183,195 ----
      free (dbf->bucket_cache[index].ca_data.dptr);
      }

!   /* dbf->desc           = new_dbf->desc; */
    dbf->header         = new_dbf->header;
    dbf->dir            = new_dbf->dir;
    dbf->bucket         = new_dbf->bucket;
    dbf->bucket_dir     = new_dbf->bucket_dir;
!   /* dbf->cache_entry    = new_dbf->cache_entry; */
!   dbf->cache_entry    = &dbf->bucket_cache[new_dbf->last_read];
    dbf->last_read      = new_dbf->last_read;
    for (index = 0; index < CACHE_SIZE; index++)
      dbf->bucket_cache[index] = new_dbf->bucket_cache[index];
***************
*** 187,192 ****
--- 202,209 ----

    /* Make sure the new database is all on disk. */
    fsync (dbf->desc);
+
+   free(new_name);

    return 0;
  }
--- cut here

phil

 ------------------------------------------------------------------------------
   ___/   /
   /_/)  /         Phil Male, Information Systems Engineering Group
  / /_ '/  Computer Newspaper Services, The Bishops Manor, Howden, DN14 7BL
 / / ///
 ------------------------------------------------------------------------------

Confidence is the feeling you have before you understand the situation.