Re: common clk: fix clk_register_fixed_rate() under memory pressure

[Turquette, Mike]

On Thu, Apr 5, 2012 at 1:48 AM, Domenico Andreoli <cavokz@xxxxxxxxx> wrote:
> From: Domenico Andreoli <cavokz@xxxxxxxxx>
>
> Under memory pressure clk_register_fixed_rate() fails to manage
> allocation errors and prepares land for a later WARN_ON at best.
>
> This fix leaves parent_names correctly initialized or NULL, intermediate
> half initialized states are cleaned up and not propagated to the clock
> framework.
>
> Signed-off-by: Domenico Andreoli <cavokz@xxxxxxxxx>

Thanks for the patch Domenico.  I did a big cleanup of the
registration code for all of the basic clock types and a fix for this
has already been rolled in to that branch, so I won't be taking this
patch.  I'll Cc you on the fixes when I send them to the list
(probably tomorrow).

Regards,
Mike

> Cc: Mike Turquette <mturquette@xxxxxxxxxx>
> Cc: Arnd Bergman <arnd.bergmann@xxxxxxxxxx>
> Cc: Rob Herring <rob.herring@xxxxxxxxxxx>
> Cc: Andrew Lunn <andrew@xxxxxxx>
>
> ---
>  drivers/clk/clk-fixed-rate.c |    7 +++++--
>  1 file changed, 5 insertions(+), 2 deletions(-)
>
> Index: b/drivers/clk/clk-fixed-rate.c
> ===================================================================
> --- a/drivers/clk/clk-fixed-rate.c
> +++ b/drivers/clk/clk-fixed-rate.c
> @@ -67,8 +67,11 @@ struct clk *clk_register_fixed_rate(stru
>
>                parent_names[0] = kmalloc(len, GFP_KERNEL);
>
> -               if (!parent_names[0])
> +               if (!parent_names[0]) {
> +                       kfree(parent_names);
> +                       parent_names = NULL;
>                        goto out;
> +               }
>
>                strncpy(parent_names[0], parent_name, len);
>        }
> @@ -77,6 +80,6 @@ out:
>        return clk_register(dev, name,
>                        &clk_fixed_rate_ops, &fixed->hw,
>                        parent_names,
> -                       (parent_name ? 1 : 0),
> +                       (parent_names ? 1 : 0),
>                        flags);
>  }
>
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