linux-kernel - Re: [syzbot] [PATCH] Test for 6465e260f487

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Date:   Mon, 20 Nov 2023 02:56:04 -0800
From:   syzbot <syzbot+de4025c006ec68ac56fc@...kaller.appspotmail.com>
To:     linux-kernel@...r.kernel.org
Subject: Re: [syzbot] [PATCH] Test for 6465e260f487

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Subject: [PATCH] Test for 6465e260f487
Author: eadavis@...a.com

please test warn in __nf_unregister_net_hook

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 6465e260f487

diff --git a/net/netfilter/nft_chain_filter.c b/net/netfilter/nft_chain_filter.c
index 680fe557686e..246f381a8970 100644
--- a/net/netfilter/nft_chain_filter.c
+++ b/net/netfilter/nft_chain_filter.c
@@ -368,6 +368,9 @@ static int nf_tables_netdev_event(struct notifier_block *this,
 	    event != NETDEV_CHANGENAME)
 		return NOTIFY_DONE;
 
+	if (!check_net(ctx.net))
+		return NOTIFY_DONE;
+
 	nft_net = nft_pernet(ctx.net);
 	mutex_lock(&nft_net->commit_mutex);
 	list_for_each_entry(table, &nft_net->tables, list) {