netdev - [PATCH] net: bridge: fix error return code of do_update

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Message-Id: <20210309022854.17904-1-baijiaju1990@gmail.com>
Date:   Mon,  8 Mar 2021 18:28:54 -0800
From:   Jia-Ju Bai <baijiaju1990@...il.com>
To:     pablo@...filter.org, kadlec@...filter.org, fw@...len.de,
        roopa@...dia.com, nikolay@...dia.com, davem@...emloft.net,
        kuba@...nel.org
Cc:     netfilter-devel@...r.kernel.org, coreteam@...filter.org,
        bridge@...ts.linux-foundation.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Jia-Ju Bai <baijiaju1990@...il.com>
Subject: [PATCH] net: bridge: fix error return code of do_update_counters()

When find_table_lock() returns NULL to t, no error return code of
do_update_counters() is assigned.
To fix this bug, ret is assigned with -ENOENT in this case.

Fixes: 49facff9f925 ("netfilter: ebtables: split update_counters into two functions")
Reported-by: TOTE Robot <oslab@...nghua.edu.cn>
Signed-off-by: Jia-Ju Bai <baijiaju1990@...il.com>
---
 net/bridge/netfilter/ebtables.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/bridge/netfilter/ebtables.c b/net/bridge/netfilter/ebtables.c
index ebe33b60efd6..66c9e4077985 100644
--- a/net/bridge/netfilter/ebtables.c
+++ b/net/bridge/netfilter/ebtables.c
@@ -1256,8 +1256,10 @@ static int do_update_counters(struct net *net, const char *name,
 		return -ENOMEM;
 
 	t = find_table_lock(net, name, &ret, &ebt_mutex);
-	if (!t)
+	if (!t) {
+		ret = -ENOENT;
 		goto free_tmp;
+	}
 
 	if (num_counters != t->private->nentries) {
 		ret = -EINVAL;
-- 
2.17.1