From 3dd7279fb6db05ec5a088cd0cae6ba22580a82bd Mon Sep 17 00:00:00 2001
From: Patrick McHardy <kaber@trash.net>
Date: Sat, 25 Jan 2014 08:04:07 +0000
Subject: [PATCH] netfilter: nf_tables: fix oops when deleting a chain with
 references

The following commands trigger an oops:

 # nft -i
 nft> add table filter
 nft> add chain filter input { type filter hook input priority 0; }
 nft> add chain filter test
 nft> add rule filter input jump test
 nft> delete chain filter test

We need to check the chain use counter before allowing destruction since
we might have references from sets or jump rules.

Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=69341
Reported-by: Matthew Ife <deleriux1@gmail.com>
Tested-by: Matthew Ife <deleriux1@gmail.com>
Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
---
Reading git-format-patch failed