From c52e9d97d485a3eb168e3f8f3674a7bc4b419703 Mon Sep 17 00:00:00 2001
From: drh <>
Date: Fri, 27 Jun 2025 19:02:21 +0000
Subject: [PATCH] Raise an error right away if the number of aggregate terms in
 a query exceeds the maximum number of columns.

FossilOrigin-Name: 5508b56fd24016c13981ec280ecdd833007c9d8dd595edb295b984c2b487b5c8

Upstream-Status: Backport [https://github.com/sqlite/sqlite/commit/c52e9d97d485a3eb168e3f8f3674a7bc4b419703]
CVE: CVE-2025-6965
Signed-off-by: Vijay Anusuri <vanusuri@mvista.com>
---
 sqlite3.c | 31 +++++++++++++++++++++++++++----
 1 file changed, 27 insertions(+), 4 deletions(-)

diff --git a/sqlite3.c b/sqlite3.c
index 27bea6f..19d0438 100644
--- a/sqlite3.c
+++ b/sqlite3.c
@@ -14354,6 +14354,14 @@ typedef INT16_TYPE LogEst;
 #define LARGEST_UINT64 (0xffffffff|(((u64)0xffffffff)<<32))
 #define SMALLEST_INT64 (((i64)-1) - LARGEST_INT64)
 
+/*
+** Macro SMXV(n) return the maximum value that can be held in variable n,
+** assuming n is a signed integer type.  UMXV(n) is similar for unsigned
+** integer types.
+*/
+#define SMXV(n) ((((i64)1)<<(sizeof(n)*8-1))-1)
+#define UMXV(n) ((((i64)1)<<(sizeof(n)*8))-1)
+
 /*
 ** Round up a number to the next larger multiple of 8.  This is used
 ** to force 8-byte alignment on 64-bit architectures.
@@ -17939,7 +17947,7 @@ struct AggInfo {
                           ** than the source table */
   int sortingIdx;         /* Cursor number of the sorting index */
   int sortingIdxPTab;     /* Cursor number of pseudo-table */
-  int nSortingColumn;     /* Number of columns in the sorting index */
+  u32 nSortingColumn;     /* Number of columns in the sorting index */
   int mnReg, mxReg;       /* Range of registers allocated for aCol and aFunc */
   ExprList *pGroupBy;     /* The group by clause */
   struct AggInfo_col {    /* For each column used in source tables */
@@ -17947,8 +17955,8 @@ struct AggInfo {
     Expr *pCExpr;            /* The original expression */
     int iTable;              /* Cursor number of the source table */
     int iMem;                /* Memory location that acts as accumulator */
-    i16 iColumn;             /* Column number within the source table */
-    i16 iSorterColumn;       /* Column number in the sorting index */
+    int iColumn;             /* Column number within the source table */
+    int iSorterColumn;       /* Column number in the sorting index */
   } *aCol;
   int nColumn;            /* Number of used entries in aCol[] */
   int nAccumulator;       /* Number of columns that show through to the output.
@@ -108641,6 +108649,9 @@ static int analyzeAggregate(Walker *pWalker, Expr *pExpr){
             ** is not an entry there already.
             */
             int k;
+            int mxTerm = pParse->db->aLimit[SQLITE_LIMIT_COLUMN];
+
+	    assert( mxTerm <= SMXV(i16) );
             pCol = pAggInfo->aCol;
             for(k=0; k<pAggInfo->nColumn; k++, pCol++){
               if( pCol->iTable==pExpr->iTable &&
@@ -108648,6 +108659,10 @@ static int analyzeAggregate(Walker *pWalker, Expr *pExpr){
                 break;
               }
             }
+	    if( k>mxTerm ){
+	      sqlite3ErrorMsg(pParse, "more than %d aggregate terms", mxTerm);
+	      k = mxTerm;
+	    }
             if( (k>=pAggInfo->nColumn)
              && (k = addAggInfoColumn(pParse->db, pAggInfo))>=0
             ){
@@ -108685,6 +108700,7 @@ static int analyzeAggregate(Walker *pWalker, Expr *pExpr){
             ExprSetVVAProperty(pExpr, EP_NoReduce);
             pExpr->pAggInfo = pAggInfo;
             pExpr->op = TK_AGG_COLUMN;
+	    assert( k <= SMXV(pExpr->iAgg) );
             pExpr->iAgg = (i16)k;
             break;
           } /* endif pExpr->iTable==pItem->iCursor */
@@ -108700,13 +108716,19 @@ static int analyzeAggregate(Walker *pWalker, Expr *pExpr){
         ** function that is already in the pAggInfo structure
         */
         struct AggInfo_func *pItem = pAggInfo->aFunc;
+	int mxTerm = pParse->db->aLimit[SQLITE_LIMIT_COLUMN];
+	assert( mxTerm <= SMXV(i16) );
         for(i=0; i<pAggInfo->nFunc; i++, pItem++){
           if( pItem->pFExpr==pExpr ) break;
           if( sqlite3ExprCompare(0, pItem->pFExpr, pExpr, -1)==0 ){
             break;
           }
         }
-        if( i>=pAggInfo->nFunc ){
+        if( i>mxTerm ){
+	  sqlite3ErrorMsg(pParse, "more than %d aggregate terms", mxTerm);
+	  i = mxTerm;
+	  assert( i<pAggInfo->nFunc );
+	}else if( i>=pAggInfo->nFunc ){
           /* pExpr is original.  Make a new entry in pAggInfo->aFunc[]
           */
           u8 enc = ENC(pParse->db);
@@ -108731,6 +108753,7 @@ static int analyzeAggregate(Walker *pWalker, Expr *pExpr){
         */
         assert( !ExprHasProperty(pExpr, EP_TokenOnly|EP_Reduced) );
         ExprSetVVAProperty(pExpr, EP_NoReduce);
+	assert( i <= SMXV(pExpr->iAgg) );
         pExpr->iAgg = (i16)i;
         pExpr->pAggInfo = pAggInfo;
         return WRC_Prune;
-- 
2.25.1

