netfilter: nf_tables: fix wrong pointer passed to PTR_ERR()

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1925492
Upstream Status: commit 1fb7696

commit 1fb7696
Author: Yang Yingliang <yangyingliang@huawei.com>
Date:   Thu Jan 19 15:51:25 2023 +0800

    netfilter: nf_tables: fix wrong pointer passed to PTR_ERR()

    It should be 'chain' passed to PTR_ERR() in the error path
    after calling nft_chain_lookup() in nf_tables_delrule().

    Fixes: f80a612 ("netfilter: nf_tables: add support to destroy operation")
    Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
    Reviewed-by: Simon Horman <simon.horman@corigine.com>
    Acked-by: Fernando Fernandez Mancera <ffmancera@riseup.net>
    Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

Signed-off-by: Phil Sutter <psutter@redhat.com>

Author: SirPhuttel

net/netfilter/nf_tables_api.c

@@ -3652,7 +3652,7 @@ static int nf_tables_delrule(struct sk_buff *skb, const struct nfnl_info *info,
 		chain = nft_chain_lookup(net, table, nla[NFTA_RULE_CHAIN],
 					 genmask);
 		if (IS_ERR(chain)) {
-			if (PTR_ERR(rule) == -ENOENT &&
+			if (PTR_ERR(chain) == -ENOENT &&
 			    NFNL_MSG_TYPE(info->nlh->nlmsg_type) == NFT_MSG_DESTROYRULE)
 				return 0;