From: Myungho Jung <mhjungk@gmail.com>
To: Marcel Holtmann <marcel@holtmann.org>,
Johan Hedberg <johan.hedberg@gmail.com>
Cc: linux-bluetooth@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH v2] Bluetooth: Add NULL check for tiocmget() and tiocmset()
Date: Tue, 29 Jan 2019 21:39:28 -0800 [thread overview]
Message-ID: <20190130053925.GA26699@myunghoj-Precision-5530> (raw)
tiocmget() and tiocmset() operations are optional and some tty drivers
like pty miss the operations. We need NULL check to prevent from
dereference.
Signed-off-by: Myungho Jung <mhjungk@gmail.com>
---
drivers/bluetooth/hci_ath.c | 6 ++++++
drivers/bluetooth/hci_ldisc.c | 4 ++++
2 files changed, 10 insertions(+)
diff --git a/drivers/bluetooth/hci_ath.c b/drivers/bluetooth/hci_ath.c
index d568fbd94d6c..fb9f6323a911 100644
--- a/drivers/bluetooth/hci_ath.c
+++ b/drivers/bluetooth/hci_ath.c
@@ -185,8 +185,14 @@ static int ath_set_bdaddr(struct hci_dev *hdev, const bdaddr_t *bdaddr)
static int ath_setup(struct hci_uart *hu)
{
+ struct tty_struct *tty = hu->tty;
+
BT_DBG("hu %p", hu);
+ /* tty driver should support operations to set RTS */
+ if (!tty->driver->ops->tiocmget || !tty->driver->ops->tiocmset)
+ return -EOPNOTSUPP;
+
hu->hdev->set_bdaddr = ath_set_bdaddr;
return 0;
diff --git a/drivers/bluetooth/hci_ldisc.c b/drivers/bluetooth/hci_ldisc.c
index fbf7b4df23ab..cb31c2d8d826 100644
--- a/drivers/bluetooth/hci_ldisc.c
+++ b/drivers/bluetooth/hci_ldisc.c
@@ -314,6 +314,10 @@ void hci_uart_set_flow_control(struct hci_uart *hu, bool enable)
return;
}
+ /* tiocmget() and tiocmset() operations are optional */
+ if (!tty->driver->ops->tiocmget || !tty->driver->ops->tiocmset)
+ return;
+
if (enable) {
/* Disable hardware flow control */
ktermios = tty->termios;
--
2.17.1
next reply other threads:[~2019-01-30 5:39 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-01-30 5:39 Myungho Jung [this message]
2019-01-31 15:40 ` [PATCH v2] Bluetooth: Add NULL check for tiocmget() and tiocmset() Johan Hovold
2019-02-03 6:38 ` Myungho Jung
2019-02-03 10:53 ` Johan Hovold
2019-02-04 7:29 ` Myungho Jung
2019-02-04 9:04 ` Myungho Jung
2019-02-04 9:22 ` Johan Hovold
2019-02-04 9:29 ` Myungho Jung
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20190130053925.GA26699@myunghoj-Precision-5530 \
--to=mhjungk@gmail.com \
--cc=johan.hedberg@gmail.com \
--cc=linux-bluetooth@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=marcel@holtmann.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).