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Sun, 18 Feb 2024 07:09:42 -0800 (PST) X-Google-Smtp-Source: AGHT+IFWB+1HQKH3/cx4XDOVkxwc253bedsLJk+TmwcSSZJ1ojNUMxpmP+dQC/vu/lwyZiKwv8B7sQ== X-Received: by 2002:a17:90a:4dce:b0:299:3f5d:b5e8 with SMTP id r14-20020a17090a4dce00b002993f5db5e8mr3512975pjl.20.1708268982585; Sun, 18 Feb 2024 07:09:42 -0800 (PST) Received: from kernel-devel.local ([240d:1a:c0d:9f00:6883:65ff:fe1c:cf69]) by smtp.gmail.com with ESMTPSA id nb11-20020a17090b35cb00b0029658c7bd53sm3479311pjb.5.2024.02.18.07.09.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 18 Feb 2024 07:09:42 -0800 (PST) From: Shigeru Yoshida To: john.fastabend@gmail.com, jakub@cloudflare.com Cc: davem@davemloft.net, edumazet@google.com, pabeni@redhat.com, netdev@vger.kernel.org, bpf@vger.kernel.org, linux-kernel@vger.kernel.org, Shigeru Yoshida , syzbot+fd7b34375c1c8ce29c93@syzkaller.appspotmail.com Subject: [PATCH bpf] bpf, sockmap: Fix NULL pointer dereference in sk_psock_verdict_data_ready() Date: Mon, 19 Feb 2024 00:09:33 +0900 Message-ID: <20240218150933.6004-1-syoshida@redhat.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit syzbot reported the following NULL pointer dereference issue [1]: BUG: kernel NULL pointer dereference, address: 0000000000000000 ... RIP: 0010:0x0 ... Call Trace: sk_psock_verdict_data_ready+0x232/0x340 net/core/skmsg.c:1230 unix_stream_sendmsg+0x9b4/0x1230 net/unix/af_unix.c:2293 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0x221/0x270 net/socket.c:745 ____sys_sendmsg+0x525/0x7d0 net/socket.c:2584 ___sys_sendmsg net/socket.c:2638 [inline] __sys_sendmsg+0x2b0/0x3a0 net/socket.c:2667 do_syscall_64+0xf9/0x240 entry_SYSCALL_64_after_hwframe+0x6f/0x77 If sk_psock_verdict_data_ready() and sk_psock_stop_verdict() are called concurrently, psock->saved_data_ready can be NULL, causing the above issue. This patch fixes this issue by calling the appropriate data ready function using the sk_psock_data_ready() helper and protecting it from concurrency with sk->sk_callback_lock. Fixes: 6df7f764cd3c ("bpf, sockmap: Wake up polling after data copy") Reported-and-tested-by: syzbot+fd7b34375c1c8ce29c93@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=fd7b34375c1c8ce29c93 [1] Signed-off-by: Shigeru Yoshida --- net/core/skmsg.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/net/core/skmsg.c b/net/core/skmsg.c index 93ecfceac1bc..4d75ef9d24bf 100644 --- a/net/core/skmsg.c +++ b/net/core/skmsg.c @@ -1226,8 +1226,11 @@ static void sk_psock_verdict_data_ready(struct sock *sk) rcu_read_lock(); psock = sk_psock(sk); - if (psock) - psock->saved_data_ready(sk); + if (psock) { + read_lock_bh(&sk->sk_callback_lock); + sk_psock_data_ready(sk, psock); + read_unlock_bh(&sk->sk_callback_lock); + } rcu_read_unlock(); } } -- 2.43.0