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Prevent a NULL-pointer dereference when trying to parse a illegal

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schema entry that contains a window function while doing a RENAME COLUMN.
[forum:/forumpost/ec2a2e0deb|Forum post ec2a2e0deb].

FossilOrigin-Name: 58de3c2b1a773a71b2d6a5d9a4dc0f839185d78d64519e7d267ad133b9830120
This commit is contained in:
drh
2022-03-10 16:26:00 +00:00
parent 105dcaa503
commit 5e121a50b3
3 changed files with 13 additions and 8 deletions
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7
src/window.c
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@@ -957,7 +957,11 @@ static int disallowAggregatesInOrderByCb(Walker *pWalker, Expr *pExpr){
*/
int sqlite3WindowRewrite(Parse *pParse, Select *p){
int rc = SQLITE_OK;
if( p->pWin && p->pPrior==0 && ALWAYS((p->selFlags & SF_WinRewrite)==0) ){
if( p->pWin
&& p->pPrior==0
&& ALWAYS((p->selFlags & SF_WinRewrite)==0)
&& !IN_RENAME_OBJECT
){
Vdbe *v = sqlite3GetVdbe(pParse);
sqlite3 *db = pParse->db;
Select *pSub = 0; /* The subquery */
@@ -1032,6 +1036,7 @@ int sqlite3WindowRewrite(Parse *pParse, Select *p){
for(pWin=pMWin; pWin; pWin=pWin->pNextWin){
ExprList *pArgs;
assert( ExprUseXList(pWin->pOwner) );
assert( pWin->pWFunc!=0 );
pArgs = pWin->pOwner->x.pList;
if( pWin->pWFunc->funcFlags & SQLITE_FUNC_SUBTYPE ){
selectWindowRewriteEList(pParse, pMWin, pSrc, pArgs, pTab, &pSublist);