linux-kernel - [PATCH 4.9 093/177] netfilter: x_tables: unlock on error in xt_find_table

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Message-Id: <20180323094209.397050965@linuxfoundation.org>
Date:   Fri, 23 Mar 2018 10:53:41 +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, Dan Carpenter <dan.carpenter@...cle.com>,
        Florian Westphal <fw@...len.de>,
        Pablo Neira Ayuso <pablo@...filter.org>,
        Sasha Levin <alexander.levin@...rosoft.com>
Subject: [PATCH 4.9 093/177] netfilter: x_tables: unlock on error in xt_find_table_lock()

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

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

From: Dan Carpenter <dan.carpenter@...cle.com>


[ Upstream commit 7dde07e9c53617549d67dd3e1d791496d0d3868e ]

According to my static checker we should unlock here before the return.
That seems reasonable to me as well.

Fixes" b9e69e127397 ("netfilter: xtables: don't hook tables by default")
Signed-off-by: Dan Carpenter <dan.carpenter@...cle.com>
Acked-by: Florian Westphal <fw@...len.de>
Signed-off-by: Pablo Neira Ayuso <pablo@...filter.org>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/netfilter/x_tables.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/net/netfilter/x_tables.c
+++ b/net/netfilter/x_tables.c
@@ -1006,8 +1006,10 @@ struct xt_table *xt_find_table_lock(stru
 	list_for_each_entry(t, &init_net.xt.tables[af], list) {
 		if (strcmp(t->name, name))
 			continue;
-		if (!try_module_get(t->me))
+		if (!try_module_get(t->me)) {
+			mutex_unlock(&xt[af].mutex);
 			return NULL;
+		}
 
 		mutex_unlock(&xt[af].mutex);
 		if (t->table_init(net) != 0) {