linux-kernel - re /drivers/char/n_tty.c drops characters

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Message-ID: <48BE5903.1040207@option.com>
Date:	Wed, 03 Sep 2008 11:29:39 +0200
From:	Denis Joseph Barrow <D.Barow@...ion.com>
To:	linux-kernel@...r.kernel.org,
	Andrew Bird <ajb@...eresystems.co.uk>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Jeff Garzik <jgarzik@...ox.com>
Subject: re /drivers/char/n_tty.c drops characters

Hi all,
It looks like the it was the intention that n_tty.c
would not drop characters in older kernels around 2.6.15 in the
n_tty layer if N_TTY_BUF_SIZE was 4096 bytes
as TTY_FLIPBUF_SIZE was only 512 bytes.

Now since 2.6.15 or so tty_buffer_alloc in tty_io.c is capible
of allocating a tty buffer of over 64k I believe this
means that the n_tty_receive_buf will overflow if tty_buffer_alloc 
throws a buffer of over 4k to n_tty_receive_buf.

Any comments?

-- 
best regards,
D.J. Barrow
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