linux-kernel - Re: [PATCH] clk: fix possible null pointer dereference

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Message-ID: <20150117214535.22722.64996@quantum>
Date:	Sat, 17 Jan 2015 13:45:35 -0800
From:	Mike Turquette <mturquette@...aro.org>
To:	Stephen Boyd <sboyd@...eaurora.org>,
	"Stanimir Varbanov" <svarbanov@...sol.com>
Cc:	linux-kernel@...r.kernel.org,
	"Tomeu Vizoso" <tomeu.vizoso@...labora.com>
Subject: Re: [PATCH] clk: fix possible null pointer dereference

Quoting Stephen Boyd (2015-01-05 11:34:32)
> On 01/05/2015 08:04 AM, Stanimir Varbanov wrote:
> > The commit 646cafc6 (clk: Change clk_ops->determine_rate to
> > return a clk_hw as the best parent) opens a possibility for
> > null pointer dereference, fix this.
> >
> > Signed-off-by: Stanimir Varbanov <svarbanov@...sol.com>
> 
> Yep. Hopefully we can clean this all up soon.
> 
> Reviewed-by: Stephen Boyd <sboyd@...eaurora.org>

Applied to clk-fixes.

Regards,
Mike

> 
> > ---
> >  drivers/clk/clk.c |    2 +-
> >  1 files changed, 1 insertions(+), 1 deletions(-)
> >
> > diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
> > index f4963b7..d48ac71 100644
> > --- a/drivers/clk/clk.c
> > +++ b/drivers/clk/clk.c
> > @@ -1366,7 +1366,7 @@ static struct clk *clk_calc_new_rates(struct clk *clk, unsigned long rate)
> >               new_rate = clk->ops->determine_rate(clk->hw, rate,
> >                                                   &best_parent_rate,
> >                                                   &parent_hw);
> > -             parent = parent_hw->clk;
> > +             parent = parent_hw ? parent_hw->clk : NULL;
> >       } else if (clk->ops->round_rate) {
> >               new_rate = clk->ops->round_rate(clk->hw, rate,
> >                                               &best_parent_rate);
> 
> 
> -- 
> Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
> a Linux Foundation Collaborative Project
> 
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