lkml.org 
[lkml]   [2010]   [May]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Date
SubjectRe: [PATCH] serial: mpc52xx_uart: fix null pointer dereference
On Wed, May 5, 2010 at 12:18 AM, Anatolij Gustschin <agust@denx.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@gmail.com>
> Signed-off-by: Anatolij Gustschin <agust@denx.de>

Thanks for being so quick to pick up on this Anatolij. I've been
traveling and not able to respond to stuff. I see that Greg has
already picked this up (thanks Greg!), but FWIW:

Acked-by: Grant Likely <grant.likely@secretlab.ca>

Actually, now that I look, this fix needs to go into Linus' tree right
away (not just linux-next) since the offending patch went in during
the 2.6.34 merge window.

Greg, I can either pick this up and push it out to Linus tomorrow, or
let you do it. Whichever you prefer. Let me know so I don't cause
conflicts in your tree.

On another note, this patch isn't actually the right fix, but that's
because this driver is such a horribly bad example of handling private
data that doing the right thing requires some re-architecting. The
driver should not need any of that extra code in the module_init hook.
For now this is the best thing to do, but I'll dig into it tomorrow
and see if I can churn out a patch to fix it properly for the 2.6.35
merge window.

Cheers and thanks,
g.

> ---
>  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
>
>



--
Grant Likely, B.Sc., P.Eng.
Secret Lab Technologies Ltd.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2010-05-10 00:09    [W:0.061 / U:0.364 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site