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([2a0d:3344:247b:5810:4909:7796:7ec9:5af2]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3aba76e40c0sm5286272f8f.59.2025.06.29.23.51.36 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 29 Jun 2025 23:51:37 -0700 (PDT) Message-ID: <83640113-ae18-4d5a-945a-44eef600d42e@redhat.com> Date: Mon, 30 Jun 2025 08:51:35 +0200 Precedence: bulk X-Mailing-List: linux-s390@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: syztest To: Arnaud Lecomte , syzbot+827ae2bfb3a3529333e9@syzkaller.appspotmail.com Cc: agordeev@linux.ibm.com, alibuda@linux.alibaba.com, davem@davemloft.net, edumazet@google.com, guwen@linux.alibaba.com, horms@kernel.org, jaka@linux.ibm.com, kuba@kernel.org, linux-kernel@vger.kernel.org, linux-rdma@vger.kernel.org, linux-s390@vger.kernel.org, netdev@vger.kernel.org, syzkaller-bugs@googlegroups.com, tonylu@linux.alibaba.com, wenjia@linux.ibm.com References: <67eaf9b8.050a0220.3c3d88.004a.GAE@google.com> <20250629132933.33599-1-contact@arnaud-lcm.com> Content-Language: en-US From: Paolo Abeni In-Reply-To: <20250629132933.33599-1-contact@arnaud-lcm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 6/29/25 3:29 PM, Arnaud Lecomte wrote: > #syz test > > --- a/net/smc/af_smc.c > +++ b/net/smc/af_smc.c > @@ -123,11 +123,14 @@ static struct sock *smc_tcp_syn_recv_sock(const struct sock *sk, > struct request_sock *req_unhash, > bool *own_req) > { > + read_lock_bh(&((struct sock *)sk)->sk_callback_lock); > struct smc_sock *smc; > struct sock *child; > - > smc = smc_clcsock_user_data(sk); > > + if (!smc) > + goto drop; > + > if (READ_ONCE(sk->sk_ack_backlog) + atomic_read(&smc->queued_smc_hs) > > sk->sk_max_ack_backlog) > goto drop; > @@ -148,9 +151,11 @@ static struct sock *smc_tcp_syn_recv_sock(const struct sock *sk, > if (inet_csk(child)->icsk_af_ops == inet_csk(sk)->icsk_af_ops) > inet_csk(child)->icsk_af_ops = smc->ori_af_ops; > } > + read_unlock_bh(&((struct sock *)sk)->sk_callback_lock); > return child; > > drop: > + read_unlock_bh(&((struct sock *)sk)->sk_callback_lock); > dst_release(dst); > tcp_listendrop(sk); > return NULL; > @@ -2613,7 +2618,7 @@ int smc_listen(struct socket *sock, int backlog) > int rc; > > smc = smc_sk(sk); > - lock_sock(sk); > + lock_sock(sock->sk); > > rc = -EINVAL; > if ((sk->sk_state != SMC_INIT && sk->sk_state != SMC_LISTEN) || Please stop cc-ing netdev and other kernel ML with this tests. You should keep just the syzkaller related MLs and a very restricted list of individuals (i.e. no maintainers). Thanks, Paolo