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Overview
Comment:Fix a null-pointer dereference that can occur following a DISKFULL error while running VACUUM. (CVS 5096)
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SHA1: 438d77a762a6f3cc7438e4d688013cc26e3e9486
User & Date: drh 2008-05-07 12:45:41
Context
2008-05-07
13:28
Add a new I/O error test: ioerr4. (CVS 5097) check-in: c3ab1a7e user: drh tags: trunk
12:45
Fix a null-pointer dereference that can occur following a DISKFULL error while running VACUUM. (CVS 5096) check-in: 438d77a7 user: drh tags: trunk
12:29
Omit mutex variables in the pager when threadsafe is disabled. (CVS 5095) check-in: d15d0bba user: drh tags: trunk
Changes
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Changes to src/pager.c.

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** The pager is used to access a database disk file.  It implements
** atomic commit and rollback through the use of a journal file that
** is separate from the database file.  The pager also implements file
** locking to prevent two processes from writing the same database
** file simultaneously, or one process from reading the database while
** another is writing.
**
** @(#) $Id: pager.c,v 1.441 2008/05/07 12:29:56 drh Exp $
*/
#ifndef SQLITE_OMIT_DISKIO
#include "sqliteInt.h"
#include <assert.h>
#include <string.h>

/*
................................................................................
**
** If the number of references to the page drop to zero, then the
** page is added to the LRU list.  When all references to all pages
** are released, a rollback occurs and the lock on the database is
** removed.
*/
int sqlite3PagerUnref(DbPage *pPg){



  Pager *pPager = pPg->pPager;

  /* Decrement the reference count for this page
  */
  assert( pPg->nRef>0 );
  pagerEnter(pPg->pPager);
  pPg->nRef--;








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** The pager is used to access a database disk file.  It implements
** atomic commit and rollback through the use of a journal file that
** is separate from the database file.  The pager also implements file
** locking to prevent two processes from writing the same database
** file simultaneously, or one process from reading the database while
** another is writing.
**
** @(#) $Id: pager.c,v 1.442 2008/05/07 12:45:41 drh Exp $
*/
#ifndef SQLITE_OMIT_DISKIO
#include "sqliteInt.h"
#include <assert.h>
#include <string.h>

/*
................................................................................
**
** If the number of references to the page drop to zero, then the
** page is added to the LRU list.  When all references to all pages
** are released, a rollback occurs and the lock on the database is
** removed.
*/
int sqlite3PagerUnref(DbPage *pPg){
  Pager *pPager;

  if( pPg==0 ) return SQLITE_OK;
  pPager = pPg->pPager;

  /* Decrement the reference count for this page
  */
  assert( pPg->nRef>0 );
  pagerEnter(pPg->pPager);
  pPg->nRef--;