[<prev] [next>] [day] [month] [year] [list]
Message-Id: <20230710070745.5505-1-jlee@suse.com>
Date: Mon, 10 Jul 2023 15:07:45 +0800
From: "Lee, Chun-Yi" <joeyli.kernel@...il.com>
To: Marcel Holtmann <marcel@...tmann.org>,
Johan Hedberg <johan.hedberg@...il.com>
Cc: linux-bluetooth@...r.kernel.org, linux-kernel@...r.kernel.org,
Yu Hao <yhao016@....edu>, "Lee, Chun-Yi" <jlee@...e.com>
Subject: [PATCH] Bluetooth: hci_ldisc: check HCI_UART_PROTO_READY flag in HCIUARTGETPROTO
This patch adds code to check HCI_UART_PROTO_READY flag before
accessing hci_uart->proto. It fixs the race condition in
hci_uart_tty_ioctl() between HCIUARTSETPROTO and HCIUARTGETPROTO.
This issue bug found by Yu Hao and Weiteng Chen:
BUG: general protection fault in hci_uart_tty_ioctl
https://lore.kernel.org/all/CA+UBctC3p49aTgzbVgkSZ2+TQcqq4fPDO7yZitFT5uBPDeCO2g@mail.gmail.com/
The information of C reproducer can also reference here:
https://lore.kernel.org/lkml/CA+UBctDPEvHdkHMwD340=n02rh+jNRJNNQ5LBZNA+Wm4Keh2ow@mail.gmail.com/T/
Reported-by: Weiteng Chen <wchen130@....edu>
Reported-by: Yu Hao <yhao016@....edu>
Signed-off-by: "Lee, Chun-Yi" <jlee@...e.com>
---
drivers/bluetooth/hci_ldisc.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/bluetooth/hci_ldisc.c b/drivers/bluetooth/hci_ldisc.c
index efdda2c3fce8..a76eb98c0047 100644
--- a/drivers/bluetooth/hci_ldisc.c
+++ b/drivers/bluetooth/hci_ldisc.c
@@ -770,7 +770,8 @@ static int hci_uart_tty_ioctl(struct tty_struct *tty, unsigned int cmd,
break;
case HCIUARTGETPROTO:
- if (test_bit(HCI_UART_PROTO_SET, &hu->flags))
+ if (test_bit(HCI_UART_PROTO_SET, &hu->flags) &&
+ test_bit(HCI_UART_PROTO_READY, &hu->flags))
err = hu->proto->id;
else
err = -EUNATCH;
--
2.35.3
Powered by blists - more mailing lists