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Overview
Comment:Fix a potential NULL pointer dereference on a RENAME TABLE that references a VIEW with a logic error in a window function in the ORDER BY clause.
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SHA3-256: 0adb273f7e7671efb0e0a1619887e369500dfd2db7ef1b1e125c2414ea96e96f
User & Date: drh 2019-11-16 11:33:39.324
Context
2019-11-16
12:04
Do not allow shadow tables to be dropped in defensive mode. (check-in: 70390bbca4 user: drh tags: trunk)
11:33
Fix a potential NULL pointer dereference on a RENAME TABLE that references a VIEW with a logic error in a window function in the ORDER BY clause. (check-in: 0adb273f7e user: drh tags: trunk)
2019-11-15
21:16
Modify three test cases so that they work even with unusual versions of the library printf(). (check-in: 8f4a3750b7 user: drh tags: trunk)
Changes
Unified Diff Ignore Whitespace Patch
Changes to src/window.c.
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/*
** Possibly link window pWin into the list at pSel->pWin (window functions
** to be processed as part of SELECT statement pSel). The window is linked
** in if either (a) there are no other windows already linked to this
** SELECT, or (b) the windows already linked use a compatible window frame.
*/
void sqlite3WindowLink(Select *pSel, Window *pWin){
  if( 0==pSel->pWin 
   || 0==sqlite3WindowCompare(0, pSel->pWin, pWin, 0)
  ){
    pWin->pNextWin = pSel->pWin;
    if( pSel->pWin ){
      pSel->pWin->ppThis = &pWin->pNextWin;
    }
    pSel->pWin = pWin;
    pWin->ppThis = &pSel->pWin;








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/*
** Possibly link window pWin into the list at pSel->pWin (window functions
** to be processed as part of SELECT statement pSel). The window is linked
** in if either (a) there are no other windows already linked to this
** SELECT, or (b) the windows already linked use a compatible window frame.
*/
void sqlite3WindowLink(Select *pSel, Window *pWin){
  if( pSel!=0
   && (0==pSel->pWin || 0==sqlite3WindowCompare(0, pSel->pWin, pWin, 0))
  ){
    pWin->pNextWin = pSel->pWin;
    if( pSel->pWin ){
      pSel->pWin->ppThis = &pWin->pNextWin;
    }
    pSel->pWin = pWin;
    pWin->ppThis = &pSel->pWin;
︙︙
Changes to test/window1.test.
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    FROM t3
  )
  FROM (
    SELECT * FROM t2
  );
} {1 {frame ending offset must be a non-negative integer}}










finish_test








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    FROM t3
  )
  FROM (
    SELECT * FROM t2
  );
} {1 {frame ending offset must be a non-negative integer}}

# 2019-11-16 chromium issue 1025467
db close
sqlite3 db :memory:
do_catchsql_test 32.10 {
  CREATE VIEW a AS SELECT NULL INTERSECT SELECT NULL ORDER BY s() OVER R;
  CREATE TABLE a0 AS SELECT 0;
  ALTER TABLE a0 RENAME TO S;
} {1 {error in view a: 1st ORDER BY term does not match any column in the result set}}

finish_test