linux-kernel - Re: [PATCH] serial: mpc52xx_uart: fix null pointer dereference

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Date:	Wed, 5 May 2010 09:40:47 -0300
From:	Leonardo Chiquitto <leonardo.lists@...il.com>
To:	Anatolij Gustschin <agust@...x.de>
Cc:	linux-kernel@...r.kernel.org, linuxppc-dev@...abs.org,
	grant.likely@...retlab.ca, gregkh@...e.de
Subject: Re: [PATCH] serial: mpc52xx_uart: fix null pointer dereference

On Tue, May 4, 2010 at 7:18 PM, Anatolij Gustschin <agust@...x.de> wrote:
> Commit 6acc6833510db8f72b5ef343296d97480555fda9
> introduced NULL pointer dereference and kernel crash
> on ppc32 machines while booting. Fix this bug now.
>
> Reported-by: Leonardo Chiquitto <leonardo.lists@...il.com>
> Signed-off-by: Anatolij Gustschin <agust@...x.de>
> ---
>  drivers/serial/mpc52xx_uart.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
>
> diff --git a/drivers/serial/mpc52xx_uart.c b/drivers/serial/mpc52xx_uart.c
> index a176ab4..02469c3 100644
> --- a/drivers/serial/mpc52xx_uart.c
> +++ b/drivers/serial/mpc52xx_uart.c
> @@ -1467,7 +1467,7 @@ mpc52xx_uart_init(void)
>        /*
>         * Map the PSC FIFO Controller and init if on MPC512x.
>         */
> -       if (psc_ops->fifoc_init) {
> +       if (psc_ops && psc_ops->fifoc_init) {
>                ret = psc_ops->fifoc_init();
>                if (ret)
>                        return ret;
> --
> 1.7.0.4

Thanks for the quick fix, Anatolij. I just tested it and confirm it resolves
the problem.

Leonardo
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