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New assert() statements to validate the parameters to

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sqlite3BtreeCursorHint().  Fix a problem with the construction of those
parameters discovered by
[forum:/forumpost/0b53708c95|forum post 0b53708c95].

FossilOrigin-Name: 4c5a3c5fb351cc1c2ce16c33314ce19c53531f09263f87456283d9d756002f9d
This commit is contained in:
drh
2023-04-10 18:44:00 +00:00
parent 8346f8dacc
commit ed36917835
8 changed files with 68 additions and 23 deletions
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19
src/btree.c
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@@ -946,8 +946,25 @@ int sqlite3BtreeCursorRestore(BtCursor *pCur, int *pDifferentRow){
*/
void sqlite3BtreeCursorHint(BtCursor *pCur, int eHintType, ...){
/* Used only by system that substitute their own storage engine */
#ifdef SQLITE_DEBUG
if( ALWAYS(eHintType==BTREE_HINT_RANGE) ){
va_list ap;
Expr *pExpr;
Walker w;
memset(&w, 0, sizeof(w));
w.xExprCallback = sqlite3CursorRangeHintExprCheck;
va_start(ap, eHintType);
pExpr = va_arg(ap, Expr*);
w.u.aMem = va_arg(ap, Mem*);
va_end(ap);
assert( pExpr!=0 );
assert( w.u.aMem!=0 );
sqlite3WalkExpr(&w, pExpr);
}
#endif /* SQLITE_DEBUG */
}
#endif
#endif /* SQLITE_ENABLE_CURSOR_HINTS */
/*
** Provide flag hints to the cursor.