linux-kernel - Re: [PATCH 1/2] TTY: pmac_zilog, check existence of ports in pmz_console

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Date:	Mon, 6 Jan 2014 14:43:33 +0000
From:	Luis Henriques <luis.henriques@...onical.com>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.cz>, stable <stable@...r.kernel.org>,
	linux-serial@...r.kernel.org,
	Linux/m68k <linux-m68k@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Finn Thain <fthain@...egraphics.com.au>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Subject: Re: [PATCH 1/2] TTY: pmac_zilog, check existence of ports in
 pmz_console_init()

On Tue, Dec 24, 2013 at 03:39:50PM +0100, Geert Uytterhoeven wrote:
> On Fri, Nov 22, 2013 at 4:47 PM, Geert Uytterhoeven
> <geert@...ux-m68k.org> wrote:
> > When booting a multi-platform m68k kernel on a non-Mac with "console=ttyS0"
> > on the kernel command line, it crashes with:
> 
> Can we please get this in stable, too?
> 
> commit dc1dc2f8a5dd863bf2e79f338fc3ae29e99c683a
> 
> Thanks!

Thanks Geert, I'm queuing it for the 3.5 and 3.11 kernels as well.

Cheers,
--
Luis

> > Unable to handle kernel NULL pointer dereference at virtual address   (null)
> > Oops: 00000000
> > PC: [<0013ad28>] __pmz_startup+0x32/0x2a0
> > ...
> > Call Trace: [<002c5d3e>] pmz_console_setup+0x64/0xe4
> >
> > The normal tty driver doesn't crash, because init_pmz() checks
> > pmz_ports_count again after calling pmz_probe().
> >
> > In the serial console initialization path, pmz_console_init() doesn't do
> > this, causing the driver to crash later.
> >
> > Add a check for pmz_ports_count to fix this.
> >
> > Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org>
> > Cc: Finn Thain <fthain@...egraphics.com.au>
> > Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
> 
> Gr{oetje,eeting}s,
> 
>                         Geert
> 
> --
> Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org
> 
> In personal conversations with technical people, I call myself a hacker. But
> when I'm talking to journalists I just say "programmer" or something like that.
>                                 -- Linus Torvalds
> --
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