linux-kernel - Re: [PATCH] Bluetooth: Add NULL check for tiocmget() and tiocmset()

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Message-ID: <20190130095938.GP3691@localhost>
Date:   Wed, 30 Jan 2019 10:59:38 +0100
From:   Johan Hovold <johan@...nel.org>
To:     Myungho Jung <mhjungk@...il.com>
Cc:     Marcel Holtmann <marcel@...tmann.org>,
        Johan Hedberg <johan.hedberg@...il.com>,
        linux-bluetooth@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Bluetooth: Add NULL check for tiocmget() and tiocmset()

On Sun, Jan 27, 2019 at 10:59:13PM -0800, Myungho Jung wrote:
> tiocmget() and tiocmset() operations are optional and some tty drivers
> like pty miss the operations. We need NULL check before referencing
> them.

Good catch. I suggest splitting these fixes in two separate patches
(after addressing Marcel's comments).

Don't forget to CC stable and add a Fixes-tag for each, as we we want to
have this backported to stable.

> Reported-by: syzbot+a950165cbb86bdd023a4@...kaller.appspotmail.com

Actually, these two bugs were never reported by sysbot AFAIKT so no need
to give credit to anyone else here.

> Signed-off-by: Myungho Jung <mhjungk@...il.com>
> ---
>  drivers/bluetooth/hci_ath.c   | 13 ++++++++-----
>  drivers/bluetooth/hci_ldisc.c |  5 +++++
>  2 files changed, 13 insertions(+), 5 deletions(-)

Johan