linux-kernel - [PATCH 4.14 043/115] netfilter: nf_tables: fix chain filter in nf_tables_dump

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Date:   Fri,  2 Mar 2018 09:50:46 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Pablo Neira Ayuso <pablo@...filter.org>,
        Phil Sutter <phil@....cc>,
        Sasha Levin <alexander.levin@...izon.com>
Subject: [PATCH 4.14 043/115] netfilter: nf_tables: fix chain filter in nf_tables_dump_rules()

4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Pablo Neira Ayuso <pablo@...filter.org>


[ Upstream commit 24c0df82ef7919e4d10cf2e4e65d368eb2e8ea21 ]

ctx->chain may be null now that we have very large object names,
so we cannot check for ctx->chain[0] here.

Fixes: b7263e071aba7 ("netfilter: nf_tables: Allow table names of up to 255 chars")
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
Acked-by: Phil Sutter <phil@....cc>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/netfilter/nf_tables_api.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/net/netfilter/nf_tables_api.c
+++ b/net/netfilter/nf_tables_api.c
@@ -2072,7 +2072,7 @@ static int nf_tables_dump_rules(struct s
 				continue;
 
 			list_for_each_entry_rcu(chain, &table->chains, list) {
-				if (ctx && ctx->chain[0] &&
+				if (ctx && ctx->chain &&
 				    strcmp(ctx->chain, chain->name) != 0)
 					continue;