linux-kernel - [PATCH 4.4 197/312] netfilter: nf_tables: fix a wrong check to skip the inactive rules

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Message-Id: <20200508123138.296946730@linuxfoundation.org>
Date:   Fri,  8 May 2020 14:33:08 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Patrick McHardy <kaber@...sh.net>,
        Liping Zhang <liping.zhang@...eadtrum.com>,
        Pablo Neira Ayuso <pablo@...filter.org>
Subject: [PATCH 4.4 197/312] netfilter: nf_tables: fix a wrong check to skip the inactive rules

From: Liping Zhang <liping.zhang@...eadtrum.com>

commit 8fff1722f705ce5023a0d6d77a31a9d013be2a34 upstream.

nft_genmask_cur has already done left-shift operator on the gencursor,
so there's no need to do left-shift operator on it again.

Fixes: ea4bd995b0f2 ("netfilter: nf_tables: add transaction helper functions")
Cc: Patrick McHardy <kaber@...sh.net>
Signed-off-by: Liping Zhang <liping.zhang@...eadtrum.com>
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 net/netfilter/nf_tables_core.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/netfilter/nf_tables_core.c
+++ b/net/netfilter/nf_tables_core.c
@@ -130,7 +130,7 @@ next_rule:
 	list_for_each_entry_continue_rcu(rule, &chain->rules, list) {
 
 		/* This rule is not active, skip. */
-		if (unlikely(rule->genmask & (1 << gencursor)))
+		if (unlikely(rule->genmask & gencursor))
 			continue;
 
 		rulenum++;