netdev - Re: [PATCH 1/2] udp_tunnel: Add checks for nla_nest_start() in __udp_tunnel_nic_dump

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Message-ID: <3a3e0df0-fe2f-78c4-41ce-5cf194607a3a@huawei.com>
Date:   Tue, 29 Nov 2022 09:29:19 +0800
From:   Yuan Can <yuancan@...wei.com>
To:     David Ahern <dsahern@...nel.org>, <johannes@...solutions.net>,
        <davem@...emloft.net>, <yoshfuji@...ux-ipv6.org>,
        <edumazet@...gle.com>, <kuba@...nel.org>, <pabeni@...hat.com>,
        <linux-wireless@...r.kernel.org>, <netdev@...r.kernel.org>
Subject: Re: [PATCH 1/2] udp_tunnel: Add checks for nla_nest_start() in
 __udp_tunnel_nic_dump_write()


在 2022/11/28 3:39, David Ahern 写道:
> On 11/26/22 3:06 AM, Yuan Can wrote:
>> As the nla_nest_start() may fail with NULL returned, the return value needs
>> to be checked.
>>
>> Fixes: c7d759eb7b12 ("ethtool: add tunnel info interface")
>> Signed-off-by: Yuan Can <yuancan@...wei.com>
>> ---
>>   net/ipv4/udp_tunnel_nic.c | 2 ++
>>   1 file changed, 2 insertions(+)
>>
>> diff --git a/net/ipv4/udp_tunnel_nic.c b/net/ipv4/udp_tunnel_nic.c
>> index bc3a043a5d5c..75a0caa4aebe 100644
>> --- a/net/ipv4/udp_tunnel_nic.c
>> +++ b/net/ipv4/udp_tunnel_nic.c
>> @@ -624,6 +624,8 @@ __udp_tunnel_nic_dump_write(struct net_device *dev, unsigned int table,
>>   			continue;
>>   
>>   		nest = nla_nest_start(skb, ETHTOOL_A_TUNNEL_UDP_TABLE_ENTRY);
>> +		if (!nest)
>> +			goto err_cancel;
> no need to call nla_nest_cancel if nest_start fails.
Ok, thanks for the suggestion, it will be fixed in the next version.

-- 
Best regards,
Yuan Can