From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AG47ELtqVJcJWsHTwz19gt22XKL0/7AYMMe4xNywDP3akhUjmH5ETXDqAgSOPUl4h5hN+7R++7Sr ARC-Seal: i=1; a=rsa-sha256; t=1519981325; cv=none; d=google.com; s=arc-20160816; b=ianHVKulwBt9APTOoL5UI0J6dF351CxaQTQ6vy8htLVfCoBcNSpw1/8fXfdL70tXLy M26OXKDt7AclU3lbRyv25+9638imifM69UwO1lfn6xUge/tuKAOLfVsihzcO0hSeQ3M5 khAA8Kb0FHFnxFNbNrZlHLA86ebps+EltSQ9ryByYATxnEUMrL3JMYy/edLc2wayxkIF xVFvFPGrQ+A2V+/lpanIHVMxuGhWr2fXOyuBYVMvTB6Bf8O/jMfIDyX+gjhs5ZDn+d/M 2m5voSzvGi8IqlaOeHmFo6+4pUWKBJ7qCkUZvjThD0KOUhzN70BNo0Y84jQe9eAfBEDf FZ6Q== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=mime-version:user-agent:references:in-reply-to:message-id:date :subject:cc:to:from:arc-authentication-results; bh=WsrLbzVJZQ/j6K2oF+uAsev9corBk8q/YkiEjfldPl0=; b=rmB9DNJSSt8oy2e7OFA6nJ5sjXbgnqvJoPfXzqyxqZEJpWxWyERmhnRIUqGrDbqW5o xRY+XWxmjvq5VnWW8WPh4spwOEOaXyIF5awDWBJAzQq0BmD4u1Q4uTY8fN0ML22FnsGB r0dO5SR51ybG2Wor+FgJjzBvioytL4VhvPYbz1Qb/2V3B0ggg/V5zwAOMFQsPl693SMv j9KesZ4zyWIfCeA657JXz4bPY3+c3MFixbFmVuVYZyDgzxLLudJGDTwxpl/sLucTjcVI bcfvNGNal8gMbmHu8UEOqg+2kvmmhmpo5hR8uoo/KEDlrq/7t2mZ3LJiMp8LeBtNgmjw VQqA== ARC-Authentication-Results: i=1; mx.google.com; spf=softfail (google.com: domain of transitioning gregkh@linuxfoundation.org does not designate 83.175.124.243 as permitted sender) smtp.mailfrom=gregkh@linuxfoundation.org Authentication-Results: mx.google.com; spf=softfail (google.com: domain of transitioning gregkh@linuxfoundation.org does not designate 83.175.124.243 as permitted sender) smtp.mailfrom=gregkh@linuxfoundation.org From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Ying Xue , Jon Maloy , Tommi Rantala , "David S. Miller" , Sasha Levin Subject: [PATCH 4.14 057/115] tipc: fix tipc_mon_delete() oops in tipc_enable_bearer() error path Date: Fri, 2 Mar 2018 09:51:00 +0100 Message-Id: <20180302084506.194074233@linuxfoundation.org> X-Mailer: git-send-email 2.16.2 In-Reply-To: <20180302084503.856536800@linuxfoundation.org> References: <20180302084503.856536800@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-LABELS: =?utf-8?b?IlxcU2VudCI=?= X-GMAIL-THRID: =?utf-8?q?1593815615517653649?= X-GMAIL-MSGID: =?utf-8?q?1593815938556045725?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: 4.14-stable review patch. If anyone has any objections, please let me know. ------------------ From: Tommi Rantala [ Upstream commit 642a8439ddd8423b92f2e71960afe21ee1f66bb6 ] Calling tipc_mon_delete() before the monitor has been created will oops. This can happen in tipc_enable_bearer() error path if tipc_disc_create() fails. [ 48.589074] BUG: unable to handle kernel paging request at 0000000000001008 [ 48.590266] IP: tipc_mon_delete+0xea/0x270 [tipc] [ 48.591223] PGD 1e60c5067 P4D 1e60c5067 PUD 1eb0cf067 PMD 0 [ 48.592230] Oops: 0000 [#1] SMP KASAN [ 48.595610] CPU: 5 PID: 1199 Comm: tipc Tainted: G B 4.15.0-rc4-pc64-dirty #5 [ 48.597176] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.10.2-2.fc27 04/01/2014 [ 48.598489] RIP: 0010:tipc_mon_delete+0xea/0x270 [tipc] [ 48.599347] RSP: 0018:ffff8801d827f668 EFLAGS: 00010282 [ 48.600705] RAX: ffff8801ee813f00 RBX: 0000000000000204 RCX: 0000000000000000 [ 48.602183] RDX: 1ffffffff1de6a75 RSI: 0000000000000297 RDI: 0000000000000297 [ 48.604373] RBP: 0000000000000000 R08: 0000000000000000 R09: fffffbfff1dd1533 [ 48.605607] R10: ffffffff8eafbb05 R11: fffffbfff1dd1534 R12: 0000000000000050 [ 48.607082] R13: dead000000000200 R14: ffffffff8e73f310 R15: 0000000000001020 [ 48.608228] FS: 00007fc686484800(0000) GS:ffff8801f5540000(0000) knlGS:0000000000000000 [ 48.610189] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 48.611459] CR2: 0000000000001008 CR3: 00000001dda70002 CR4: 00000000003606e0 [ 48.612759] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 48.613831] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 [ 48.615038] Call Trace: [ 48.615635] tipc_enable_bearer+0x415/0x5e0 [tipc] [ 48.620623] tipc_nl_bearer_enable+0x1ab/0x200 [tipc] [ 48.625118] genl_family_rcv_msg+0x36b/0x570 [ 48.631233] genl_rcv_msg+0x5a/0xa0 [ 48.631867] netlink_rcv_skb+0x1cc/0x220 [ 48.636373] genl_rcv+0x24/0x40 [ 48.637306] netlink_unicast+0x29c/0x350 [ 48.639664] netlink_sendmsg+0x439/0x590 [ 48.642014] SYSC_sendto+0x199/0x250 [ 48.649912] do_syscall_64+0xfd/0x2c0 [ 48.650651] entry_SYSCALL64_slow_path+0x25/0x25 [ 48.651843] RIP: 0033:0x7fc6859848e3 [ 48.652539] RSP: 002b:00007ffd25dff938 EFLAGS: 00000246 ORIG_RAX: 000000000000002c [ 48.654003] RAX: ffffffffffffffda RBX: 00007ffd25dff990 RCX: 00007fc6859848e3 [ 48.655303] RDX: 0000000000000054 RSI: 00007ffd25dff990 RDI: 0000000000000003 [ 48.656512] RBP: 00007ffd25dff980 R08: 00007fc685c35fc0 R09: 000000000000000c [ 48.657697] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000d13010 [ 48.658840] R13: 00007ffd25e009c0 R14: 0000000000000000 R15: 0000000000000000 [ 48.662972] RIP: tipc_mon_delete+0xea/0x270 [tipc] RSP: ffff8801d827f668 [ 48.664073] CR2: 0000000000001008 [ 48.664576] ---[ end trace e811818d54d5ce88 ]--- Acked-by: Ying Xue Acked-by: Jon Maloy Signed-off-by: Tommi Rantala Signed-off-by: David S. Miller Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- net/tipc/monitor.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) --- a/net/tipc/monitor.c +++ b/net/tipc/monitor.c @@ -633,9 +633,13 @@ void tipc_mon_delete(struct net *net, in { struct tipc_net *tn = tipc_net(net); struct tipc_monitor *mon = tipc_monitor(net, bearer_id); - struct tipc_peer *self = get_self(net, bearer_id); + struct tipc_peer *self; struct tipc_peer *peer, *tmp; + if (!mon) + return; + + self = get_self(net, bearer_id); write_lock_bh(&mon->lock); tn->monitors[bearer_id] = NULL; list_for_each_entry_safe(peer, tmp, &self->list, list) {