From: wangyufen <wangyufen@huawei.com>
To: Cong Wang <xiyou.wangcong@gmail.com>
Cc: <john.fastabend@gmail.com>, <daniel@iogearbox.net>,
<jakub@cloudflare.com>, <lmb@cloudflare.com>,
<davem@davemloft.net>, <edumazet@google.com>,
<yoshfuji@linux-ipv6.org>, <dsahern@kernel.org>,
<kuba@kernel.org>, <ast@kernel.org>, <andrii@kernel.org>,
<kafai@fb.com>, <songliubraving@fb.com>, <yhs@fb.com>,
<kpsingh@kernel.org>, <netdev@vger.kernel.org>,
<bpf@vger.kernel.org>
Subject: Re: [PATCH bpf-next v2 2/4] bpf, sockmap: Fix memleak in tcp_bpf_sendmsg while sk msg is full
Date: Fri, 4 Mar 2022 14:51:18 +0800 [thread overview]
Message-ID: <a7788a20-3be8-b3e3-2c19-ca2d7d18e238@huawei.com> (raw)
In-Reply-To: <YiAQWaVPEmfpiale@pop-os.localdomain>
在 2022/3/3 8:48, Cong Wang 写道:
> On Wed, Mar 02, 2022 at 10:27:53AM +0800, Wang Yufen wrote:
>> diff --git a/net/ipv4/tcp_bpf.c b/net/ipv4/tcp_bpf.c
>> index 9b9b02052fd3..ac9f491cc139 100644
>> --- a/net/ipv4/tcp_bpf.c
>> +++ b/net/ipv4/tcp_bpf.c
>> @@ -421,8 +421,10 @@ static int tcp_bpf_sendmsg(struct sock *sk, struct msghdr *msg, size_t size)
>> osize = msg_tx->sg.size;
>> err = sk_msg_alloc(sk, msg_tx, msg_tx->sg.size + copy, msg_tx->sg.end - 1);
>> if (err) {
>> - if (err != -ENOSPC)
>> + if (err != -ENOSPC) {
>> + sk_msg_trim(sk, msg_tx, osize);
>> goto wait_for_memory;
> Is it a good idea to handle this logic inside sk_msg_alloc()?
Yes, I think you're right.
Other call paths of sk_msg_alloc() have the similar problem, such as
tls_sw_sendmsg(),
will do in v3.
Thanks.
> .
next prev parent reply other threads:[~2022-03-04 6:51 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-02 2:27 [PATCH bpf-next v2 0/4] bpf, sockmap: Fix memleaks and issues of mem charge/uncharge Wang Yufen
2022-03-02 2:27 ` [PATCH bpf-next v2 1/4] bpf, sockmap: Fix memleak in sk_psock_queue_msg Wang Yufen
2022-03-03 0:41 ` Cong Wang
2022-03-04 6:45 ` wangyufen
2022-03-02 2:27 ` [PATCH bpf-next v2 2/4] bpf, sockmap: Fix memleak in tcp_bpf_sendmsg while sk msg is full Wang Yufen
2022-03-03 0:48 ` Cong Wang
2022-03-04 6:51 ` wangyufen [this message]
2022-03-02 2:27 ` [PATCH bpf-next v2 3/4] bpf, sockmap: Fix more uncharged while msg has more_data Wang Yufen
2022-03-03 6:14 ` Cong Wang
2022-03-04 7:08 ` wangyufen
2022-03-02 2:27 ` [PATCH bpf-next v2 4/4] bpf, sockmap: Fix double uncharge the mem of sk_msg Wang Yufen
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