linux-kernel - Re: [PATCH] tty: Fix unreasonable write toward closed pty.

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Message-ID: <20121219191030.4ee20a1c@pyramind.ukuu.org.uk>
Date:	Wed, 19 Dec 2012 19:10:30 +0000
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Ilya Zykov <ilya@...x.ru>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Alan Cox <alan@...ux.intel.com>, Jiri Slaby <jslaby@...e.cz>,
	Peter Hurley <peter@...leysoftware.com>,
	Sasha Levin <levinsasha928@...il.com>,
	linux-serial@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] tty: Fix unreasonable write toward closed pty.

> diff --git a/drivers/tty/pty.c b/drivers/tty/pty.c
> index a82b399..1ce1362 100644
> --- a/drivers/tty/pty.c
> +++ b/drivers/tty/pty.c
> @@ -116,6 +116,8 @@ static int pty_space(struct tty_struct *to)
>  
>  static int pty_write(struct tty_struct *tty, const unsigned char *buf, int c)
>  {
> +	if (test_bit(TTY_OTHER_CLOSED, &tty->flags))
> +		return -EIO;

The flag can change between the test and ny further code being executed ?

Alan
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