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SQLite training in Houston TX on 2019-11-05 (details)
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Overview
Comment:Fix a segfault that could occur following an OOM error in the flattenSubquery() routine.
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SHA3-256: c6dda3f752c184f441624c9993e77d5031063d79a0e177b6e25a9886514a742e
User & Date: dan 2017-03-13 14:30:40
Context
2017-03-13
17:37
Fix the sqlite3TreeViewSelect() routine so that it works with a null pointer to the Select object. check-in: 9034cf7e user: drh tags: trunk
14:30
Fix a segfault that could occur following an OOM error in the flattenSubquery() routine. check-in: c6dda3f7 user: dan tags: trunk
13:45
In the OSSFuzz test module, invoke the progress handler much more frequently so that timeouts are detected punctually even if the test script is running opcodes that individually take a long time (for example, an OP_Function opcode that invokes "randomblob(1.5e6)"). check-in: f3b6959c user: drh tags: trunk
Changes
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Changes to src/select.c.

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          sqlite3ExprDup(db, pSub->pHaving, 0), pParent->pHaving
      );
      assert( pParent->pGroupBy==0 );
      pParent->pGroupBy = sqlite3ExprListDup(db, pSub->pGroupBy, 0);
    }else{
      pParent->pWhere = sqlite3ExprAnd(db, pWhere, pParent->pWhere);
    }

    substSelect(pParse, pParent, iParent, pSub->pEList, 0);

  
    /* The flattened query is distinct if either the inner or the
    ** outer query is distinct. 
    */
    pParent->selFlags |= pSub->selFlags & SF_Distinct;
  
    /*







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          sqlite3ExprDup(db, pSub->pHaving, 0), pParent->pHaving
      );
      assert( pParent->pGroupBy==0 );
      pParent->pGroupBy = sqlite3ExprListDup(db, pSub->pGroupBy, 0);
    }else{
      pParent->pWhere = sqlite3ExprAnd(db, pWhere, pParent->pWhere);
    }
    if( db->mallocFailed==0 ){
      substSelect(pParse, pParent, iParent, pSub->pEList, 0);
    }
  
    /* The flattened query is distinct if either the inner or the
    ** outer query is distinct. 
    */
    pParent->selFlags |= pSub->selFlags & SF_Distinct;
  
    /*

Added test/mallocM.test.

































































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# 2017 March 13
#
# 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.
#
#***********************************************************************
# Further OOM tests.
#

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

sqlite3_db_config_lookaside db 0 0 0

do_execsql_test 1.0 {
  CREATE TABLE t1(x);
}
do_faultsim_test 1 -faults oom-t* -body {
  execsql {
    SELECT 'abc' FROM ( SELECT 'xyz' FROM t1 WHERE (SELECT 1) )
  }
} -test {
  faultsim_test_result {0 {}}
}

finish_test