From: Pablo Neira Ayuso <pablo@netfilter.org>
Date: Tue, 19 Dec 2017 11:01:21 +0000 (+0100)
Subject: netfilter: nf_tables: fix chain filter in nf_tables_dump_rules()
X-Git-Tag: v4.14.24~73
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=e2f52fa3f8d6fa949afebbb4dc24f71bc0785803;p=platform%2Fkernel%2Flinux-exynos.git

netfilter: nf_tables: fix chain filter in nf_tables_dump_rules()


[ 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@netfilter.org>
Acked-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/net/netfilter/nf_tables_api.c b/net/netfilter/nf_tables_api.c
index 64e1ee0..ce49946 100644
--- 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 sk_buff *skb,
 				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;