sqlite/sqlite-3.26.0-CVE-2020-9327.patch

107 lines
3.7 KiB
Diff

From 2d788539b0018d34d3cabb328387ba6bec41ec42 Mon Sep 17 00:00:00 2001
From: Ondrej Dubaj <odubaj@redhat.com>
Date: Thu, 26 Mar 2020 09:43:43 +0100
Subject: [PATCH] NULL pointer dereference and segmentation fault because of
generated column optimizations
Take care when checking the table of a TK_COLUMN expression node to
see if the table is a virtual table to first ensure that the
Expr.y.pTab pointer is not null due to generated column optimizations.
---
src/expr.c | 13 ++++++++++---
src/sqliteInt.h | 3 +++
src/whereexpr.c | 12 ++++++++----
3 files changed, 21 insertions(+), 7 deletions(-)
diff --git a/src/expr.c b/src/expr.c
index b081ca2..5f98f76 100644
--- a/src/expr.c
+++ b/src/expr.c
@@ -4901,18 +4901,25 @@ static int impliesNotNullRow(Walker *pWalker, Expr *pExpr){
case TK_LT:
case TK_LE:
case TK_GT:
- case TK_GE:
+ case TK_GE: {
+ Expr *pLeft = pExpr->pLeft;
+ Expr *pRight = pExpr->pRight;
testcase( pExpr->op==TK_EQ );
testcase( pExpr->op==TK_NE );
testcase( pExpr->op==TK_LT );
testcase( pExpr->op==TK_LE );
testcase( pExpr->op==TK_GT );
testcase( pExpr->op==TK_GE );
- if( (pExpr->pLeft->op==TK_COLUMN && IsVirtual(pExpr->pLeft->y.pTab))
- || (pExpr->pRight->op==TK_COLUMN && IsVirtual(pExpr->pRight->y.pTab))
+ /* The y.pTab=0 assignment in wherecode.c always happens after the
+ ** impliesNotNullRow() test */
+ if( (pLeft->op==TK_COLUMN && ALWAYS(pLeft->y.pTab!=0)
+ && IsVirtual(pLeft->y.pTab))
+ || (pRight->op==TK_COLUMN && ALWAYS(pRight->y.pTab!=0)
+ && IsVirtual(pRight->y.pTab))
){
return WRC_Prune;
}
+ }
default:
return WRC_Continue;
}
diff --git a/src/sqliteInt.h b/src/sqliteInt.h
index 051aa40..5f5f3cc 100644
--- a/src/sqliteInt.h
+++ b/src/sqliteInt.h
@@ -2014,8 +2014,11 @@ struct Table {
*/
#ifndef SQLITE_OMIT_VIRTUALTABLE
# define IsVirtual(X) ((X)->nModuleArg)
+# define ExprIsVtab(X) \
+ ((X)->op==TK_COLUMN && (X)->y.pTab!=0 && (X)->y.pTab->nModuleArg)
#else
# define IsVirtual(X) 0
+# define ExprIsVtab(X) 0
#endif
/*
diff --git a/src/whereexpr.c b/src/whereexpr.c
index dbb7f0d..9d2813a 100644
--- a/src/whereexpr.c
+++ b/src/whereexpr.c
@@ -382,7 +382,8 @@ static int isAuxiliaryVtabOperator(
** MATCH(expression,vtab_column)
*/
pCol = pList->a[1].pExpr;
- if( pCol->op==TK_COLUMN && IsVirtual(pCol->y.pTab) ){
+ testcase( pCol->op==TK_COLUMN && pCol->y.pTab==0 );
+ if( ExprIsVtab(pCol) ){
for(i=0; i<ArraySize(aOp); i++){
if( sqlite3StrICmp(pExpr->u.zToken, aOp[i].zOp)==0 ){
*peOp2 = aOp[i].eOp2;
@@ -404,7 +405,8 @@ static int isAuxiliaryVtabOperator(
** with function names in an arbitrary case.
*/
pCol = pList->a[0].pExpr;
- if( pCol->op==TK_COLUMN && IsVirtual(pCol->y.pTab) ){
+ testcase( pCol->op==TK_COLUMN && pCol->y.pTab==0 );
+ if( ExprIsVtab(pCol) ){
sqlite3_vtab *pVtab;
sqlite3_module *pMod;
void (*xNotUsed)(sqlite3_context*,int,sqlite3_value**);
@@ -427,10 +429,12 @@ static int isAuxiliaryVtabOperator(
int res = 0;
Expr *pLeft = pExpr->pLeft;
Expr *pRight = pExpr->pRight;
- if( pLeft->op==TK_COLUMN && IsVirtual(pLeft->y.pTab) ){
+ testcase( pLeft->op==TK_COLUMN && pLeft->y.pTab==0 );
+ if( ExprIsVtab(pLeft) ){
res++;
}
- if( pRight && pRight->op==TK_COLUMN && IsVirtual(pRight->y.pTab) ){
+ testcase( pRight && pRight->op==TK_COLUMN && pRight->y.pTab==0 );
+ if( pRight && ExprIsVtab(pRight) ){
res++;
SWAP(Expr*, pLeft, pRight);
}
--
2.24.1