From 8ec9cfc81c3f8326a1c7ee5b795ef517cd48e6b4 Mon Sep 17 00:00:00 2001
From: yuxiaojun <yuxiaojun1011@outlook.com>
Date: Wed, 14 Jun 2023 11:23:24 +0800
Subject: [PATCH] Fix possible null pointer reference in ndb

slot1 and slot2 may be NULL

Signed-off-by: yuxiaojun <yuxiaojun1011@outlook.com>
---
 lib/backend/ndb/rpmxdb.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/backend/ndb/rpmxdb.c b/lib/backend/ndb/rpmxdb.c
index 2c1f29842..d9c373cb0 100644
--- a/lib/backend/ndb/rpmxdb.c
+++ b/lib/backend/ndb/rpmxdb.c
@@ -755,7 +755,7 @@ static int moveblobstofront(rpmxdb xdb, struct xdb_slot *afterslot)
 	if (slot2 == xdb->slots)
 	    slot2 = 0;
     }
-    if (slot1->pagecnt < slot2->pagecnt) {
+    if (slot1 && slot2 && slot1->pagecnt < slot2->pagecnt) {
 	struct xdb_slot *tmp = slot1;
 	slot1 = slot2;
 	slot2 = tmp;
-- 
2.27.0