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SQLite training in Houston TX on 2019-11-05 (details)
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Overview
Comment:Detect and report a particular type of database corruption that would formerly cause a segfault. (CVS 4739)
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SHA1: 6ed2d9f82e2c81d5f6c22a4e05c1a2cb5eedd10c
User & Date: drh 2008-01-22 16:35:36
Original Comment: Detect and report a particular type of database corruption that would formerly cause a segfault. (CVS 4739)
Original User & Date: drh 2008-01-22 16:35:37
Context
2008-01-22
16:35
Detect and report a particular type of database corruption that would formerly cause a segfault. (CVS 4740) check-in: f47cf3cc user: drh tags: trunk
16:35
Detect and report a particular type of database corruption that would formerly cause a segfault. (CVS 4739) check-in: 6ed2d9f8 user: drh tags: trunk
14:50
Remove dead code from the lemon-generated parser. Better testing of the sqlite3_file_control() interface, and in particular make sure the interface works on :memory: databases. (CVS 4738) check-in: 83ca4fc7 user: drh tags: trunk
Changes
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Changes to src/prepare.c.

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**    May you share freely, never taking more than you give.
**
*************************************************************************
** This file contains the implementation of the sqlite3_prepare()
** interface, and routines that contribute to loading the database schema
** from disk.
**
** $Id: prepare.c,v 1.72 2008/01/22 01:48:09 drh Exp $
*/
#include "sqliteInt.h"
#include <ctype.h>

/*
** Fill the InitData structure with an error message that indicates
** that the database is corrupt.
................................................................................
        db->mallocFailed = 1;
      }else if( rc!=SQLITE_INTERRUPT ){
        corruptSchema(pData, zErr);
      }
      sqlite3_free(zErr);
      return 1;
    }


  }else{
    /* If the SQL column is blank it means this is an index that
    ** was created to be the PRIMARY KEY or to fulfill a UNIQUE
    ** constraint for a CREATE TABLE.  The index should have already
    ** been created when we processed the CREATE TABLE.  All we have
    ** to do here is record the root page number for that index.
    */







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**    May you share freely, never taking more than you give.
**
*************************************************************************
** This file contains the implementation of the sqlite3_prepare()
** interface, and routines that contribute to loading the database schema
** from disk.
**
** $Id: prepare.c,v 1.73 2008/01/22 16:35:37 drh Exp $
*/
#include "sqliteInt.h"
#include <ctype.h>

/*
** Fill the InitData structure with an error message that indicates
** that the database is corrupt.
................................................................................
        db->mallocFailed = 1;
      }else if( rc!=SQLITE_INTERRUPT ){
        corruptSchema(pData, zErr);
      }
      sqlite3_free(zErr);
      return 1;
    }
  }else if( argv[2]==0 ){
    corruptSchema(pData, 0);
  }else{
    /* If the SQL column is blank it means this is an index that
    ** was created to be the PRIMARY KEY or to fulfill a UNIQUE
    ** constraint for a CREATE TABLE.  The index should have already
    ** been created when we processed the CREATE TABLE.  All we have
    ** to do here is record the root page number for that index.
    */

Added test/corrupt5.test.

























































































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# 2008 Jan 22
#
# The author disclaims copyright to this source code.  In place of
# a legal notice, here is a blessing:
#
#    May you do good and not evil.
#    May you find forgiveness for yourself and forgive others.
#    May you share freely, never taking more than you give.
#
#***********************************************************************
# This file implements regression tests for SQLite library.
#
# This file implements tests to make sure SQLite does not crash or
# segfault if it sees a corrupt database file.
#
# $Id: corrupt5.test,v 1.1 2008/01/22 16:35:37 drh Exp $

set testdir [file dirname $argv0]
source $testdir/tester.tcl

# We must have the page_size pragma for these tests to work.
#
ifcapable !pager_pragmas {
  finish_test
  return
}

# Create a database with a freelist containing at least two pages.
#
do_test corrupt5-1.1 {
  execsql {
    CREATE TABLE t1(a,b,c);
    CREATE INDEX i1 ON t1(a,b);
    PRAGMA writable_schema=ON;
    UPDATE sqlite_master SET name=NULL, sql=NULL WHERE name='i1';
  }
  db close
  sqlite3 db test.db
  catchsql {
    SELECT * FROM t1
  }
} {1 {malformed database schema}}

finish_test