linux-kernel - [Bluez PATCH v1] Bluetooth: Fix crash in mgmt_add_adv_patterns_monitor

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Date:   Wed,  3 Feb 2021 14:56:44 +0800
From:   Howard Chung <howardchung@...gle.com>
To:     linux-bluetooth@...r.kernel.org, marcel@...tmann.org
Cc:     Howard Chung <howardchung@...gle.com>,
        Miao-chen Chou <mcchou@...omium.org>,
        Manish Mandlik <mmandlik@...omium.org>,
        Archie Pusaka <apusaka@...omium.org>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        Luiz Augusto von Dentz <luiz.dentz@...il.com>,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: [Bluez PATCH v1] Bluetooth: Fix crash in mgmt_add_adv_patterns_monitor_complete

If hci_add_adv_monitor is a pending command(e.g. forward to
msft_add_monitor_pattern), it is possible that
mgmt_add_adv_patterns_monitor_complete gets called before
cmd->user_data gets set, which will cause a crash when we
try to get the moniter handle through cmd->user_data in
mgmt_add_adv_patterns_monitor_complete.

This moves the cmd->user_data assignment earlier than
hci_add_adv_monitor.

RIP: 0010:mgmt_add_adv_patterns_monitor_complete+0x82/0x187 [bluetooth]
Code: 1e bf 03 00 00 00 be 52 00 00 00 4c 89 ea e8 9e
e4 02 00 49 89 c6 48 85 c0 0f 84 06 01 00 00 48 89 5d b8 4c 89 fb 4d 8b
7e 30 <41> 0f b7 47 18 66 89 45 c0 45 84 e4 75 5a 4d 8b 56 28 48 8d 4d
c8
RSP: 0018:ffffae81807dbcb8 EFLAGS: 00010286
RAX: ffff91c4bdf723c0 RBX: 0000000000000000 RCX: ffff91c4e5da5b80
RDX: ffff91c405680000 RSI: 0000000000000052 RDI: ffff91c49d654c00
RBP: ffffae81807dbd00 R08: ffff91c49fb157e0 R09: ffff91c49fb157e0
R10: 000000000002a4f0 R11: ffffffffc0819cfd R12: 0000000000000000
R13: ffff91c405680000 R14: ffff91c4bdf723c0 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff91c4ea300000(0000)
knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000018 CR3: 0000000133612002 CR4:
00000000003606e0
Call Trace:
 ? msft_le_monitor_advertisement_cb+0x111/0x141
[bluetooth]
 hci_event_packet+0x425e/0x631c [bluetooth]
 ? printk+0x59/0x73
 ? __switch_to_asm+0x41/0x70
 ?
msft_le_set_advertisement_filter_enable_cb+0xa6/0xa6 [bluetooth]
 ? bt_dbg+0xb4/0xbb [bluetooth]
 ? __switch_to_asm+0x41/0x70
 hci_rx_work+0x101/0x319 [bluetooth]
 process_one_work+0x257/0x506
 worker_thread+0x10d/0x284
 kthread+0x14c/0x154
 ? process_one_work+0x506/0x506
 ? kthread_blkcg+0x2c/0x2c
 ret_from_fork+0x1f/0x40

Reviewed-by: Miao-chen Chou <mcchou@...omium.org>
Reviewed-by: Manish Mandlik <mmandlik@...omium.org>
Reviewed-by: Archie Pusaka <apusaka@...omium.org>
Signed-off-by: Howard Chung <howardchung@...gle.com>
---

 net/bluetooth/mgmt.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c
index 8ff9c4bb43d11..74971b4bd4570 100644
--- a/net/bluetooth/mgmt.c
+++ b/net/bluetooth/mgmt.c
@@ -4303,6 +4303,7 @@ static int __add_adv_patterns_monitor(struct sock *sk, struct hci_dev *hdev,
 		goto unlock;
 	}
 
+	cmd->user_data = m;
 	pending = hci_add_adv_monitor(hdev, m, &err);
 	if (err) {
 		if (err == -ENOSPC || err == -ENOMEM)
@@ -4330,7 +4331,6 @@ static int __add_adv_patterns_monitor(struct sock *sk, struct hci_dev *hdev,
 
 	hci_dev_unlock(hdev);
 
-	cmd->user_data = m;
 	return 0;
 
 unlock:
-- 
2.30.0.365.g02bc693789-goog