linux-kernel - Re: [PATCH] clk: check for invalid parent index of orphans in __clk

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Date:	Thu, 17 Sep 2015 15:25:50 -0700
From:	Stephen Boyd <sboyd@...eaurora.org>
To:	Måns Rullgård <mans@...sr.com>
Cc:	Michael Turquette <mturquette@...libre.com>,
	Rhyland Klein <rklein@...dia.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] clk: check for invalid parent index of orphans in
 __clk_init()

On 09/15, Måns Rullgård wrote:
> Michael Turquette <mturquette@...aro.org> writes:
> 
> > Quoting Rhyland Klein (2015-02-17 08:58:29)
> >> On 2/15/2015 7:33 AM, Mans Rullgard wrote:
> >> > If a mux clock is initialised (by hardware or firmware) with an
> >> > invalid parent, its ->get_parent() can return an out of range
> >> > index.  For example, the generic mux clock attempts to return
> >> > -EINVAL, which due to the u8 return type ends up a rather large
> >> > number.  Using this index with the parent_names[] array results
> >> > in an invalid pointer and (usually) a crash in the following
> >> > strcmp().
> >> > 
> >> > This patch adds a check for the parent index being in range,
> >> > ignoring clocks reporting invalid values.
> >> > 
> >> > Signed-off-by: Mans Rullgard <mans@...sr.com>
> >> > Cc: Rhyland Klein <rklein@...dia.com>
> >> > ---
> >> >  drivers/clk/clk.c | 3 ++-
> >> >  1 file changed, 2 insertions(+), 1 deletion(-)
> >> > 
> >> > diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
> >> > index d48ac71..bc0662b 100644
> >> > --- a/drivers/clk/clk.c
> >> > +++ b/drivers/clk/clk.c
> >> > @@ -1950,7 +1950,8 @@ int __clk_init(struct device *dev, struct clk *clk)
> >> >       hlist_for_each_entry_safe(orphan, tmp2, &clk_orphan_list, child_node) {
> >> >               if (orphan->num_parents && orphan->ops->get_parent) {
> >> >                       i = orphan->ops->get_parent(orphan->hw);
> >> > -                     if (!strcmp(clk->name, orphan->parent_names[i]))
> >> > +                     if (i >= 0 && i < orphan->num_parents &&
> >> > +                         !strcmp(clk->name, orphan->parent_names[i]))
> >> >                               __clk_reparent(orphan, clk);
> >> >                       continue;
> >> >               }
> >> > 
> >> 
> >> This works for me and is less invasive than the original patch series.
> >> 
> >> Tested-by: Rhyland Klein <rklein@...dia.com>
> >
> > Applied.
> 
> Did this get lost somewhere?  It's not in mainline, and I can't find it
> in the clk tree on kernel.org either.

I think it got lost. I've applied this to clk-fixes.

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