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

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Date:	Tue, 24 Dec 2013 15:39:50 +0100
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jslaby@...e.cz>, stable <stable@...r.kernel.org>
Cc:	linux-serial@...r.kernel.org,
	"Linux/m68k" <linux-m68k@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Geert Uytterhoeven <geert@...ux-m68k.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 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!

> 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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