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Overview
Comment:Harden sqlite3session_delete() against trying to delete a session that is not currently on the session list.
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SHA1: 6c2d34df76fb7823f307c11a1135ab30674421a9
User & Date: drh 2016-02-13 14:45:56
Context
2016-02-13
15:08
Fix another test problem in sessionfault.test. check-in: f6d1cf79 user: dan tags: sessions
14:45
Harden sqlite3session_delete() against trying to delete a session that is not currently on the session list. check-in: 6c2d34df user: drh tags: sessions
14:39
Fix a problem in sessionfault.test causing it to segfault following a test failure. This commit does not fix the actual test failure - just the subsequent segfault. check-in: 582b2ae7 user: dan tags: sessions
Changes
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Changes to ext/session/sqlite3session.c.

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  sqlite3_session *pHead;
  sqlite3_session **pp;

  /* Unlink the session from the linked list of sessions attached to the
  ** database handle. Hold the db mutex while doing so.  */
  sqlite3_mutex_enter(sqlite3_db_mutex(db));
  pHead = (sqlite3_session*)sqlite3_preupdate_hook(db, 0, 0);
  for(pp=&pHead; (*pp)!=pSession; pp=&((*pp)->pNext));

  *pp = (*pp)->pNext;
  if( pHead ) sqlite3_preupdate_hook(db, xPreUpdate, (void *)pHead);



  sqlite3_mutex_leave(sqlite3_db_mutex(db));

  /* Delete all attached table objects. And the contents of their 
  ** associated hash-tables. */
  sessionDeleteTable(pSession->pTable);

  /* Free the session object itself. */







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  sqlite3_session *pHead;
  sqlite3_session **pp;

  /* Unlink the session from the linked list of sessions attached to the
  ** database handle. Hold the db mutex while doing so.  */
  sqlite3_mutex_enter(sqlite3_db_mutex(db));
  pHead = (sqlite3_session*)sqlite3_preupdate_hook(db, 0, 0);
  for(pp=&pHead; ALWAYS((*pp)!=0); pp=&((*pp)->pNext)){
    if( (*pp)==pSession ){
      *pp = (*pp)->pNext;
      if( pHead ) sqlite3_preupdate_hook(db, xPreUpdate, (void*)pHead);
      break;
    }
  }
  sqlite3_mutex_leave(sqlite3_db_mutex(db));

  /* Delete all attached table objects. And the contents of their 
  ** associated hash-tables. */
  sessionDeleteTable(pSession->pTable);

  /* Free the session object itself. */