From 219b8e7e7587df8669d96ce867cdd61ca1c05730 Mon Sep 17 00:00:00 2001
From: drh <drh@noemail.net>
Date: Thu, 14 May 2020 23:59:24 +0000
Subject: [PATCH] Fix a null pointer deference that can occur on a strange
 matchinfo() query.

FossilOrigin-Name: a4dd148928ea65bd4e1654dfacc3d8057d1f85b8c9939416991d50722e5a720e

Upstream-Status: Backport
CVE: CVE-2020-13632
[https://github.com/sqlite/sqlite/commit/219b8e7e7587df8669d96ce867cdd61ca1c05730]
Signed-off-by: Li Wang <li.wang@windriver.com>
---
 sqlite3.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sqlite3.c b/sqlite3.c
index fd28360..ee455e5 100644
--- a/sqlite3.c
+++ b/sqlite3.c
@@ -177622,7 +177622,7 @@ static int fts3ExprLHits(
     iStart = pExpr->iPhrase * ((p->nCol + 31) / 32);
   }
 
-  while( 1 ){
+  if( pIter ) while( 1 ){
     int nHit = fts3ColumnlistCount(&pIter);
     if( (pPhrase->iColumn>=pTab->nColumn || pPhrase->iColumn==iCol) ){
       if( p->flag==FTS3_MATCHINFO_LHITS ){
-- 
2.17.1