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

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Date:	Mon, 05 Jan 2015 11:34:32 -0800
From:	Stephen Boyd <sboyd@...eaurora.org>
To:	Stanimir Varbanov <svarbanov@...sol.com>,
	Mike Turquette <mturquette@...aro.org>
CC:	linux-kernel@...r.kernel.org,
	Tomeu Vizoso <tomeu.vizoso@...labora.com>
Subject: Re: [PATCH] clk: fix possible null pointer dereference

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>

> ---
>  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);


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