linux-kernel - Re: [PATCH] clk: qcom: Fix a possible NULL pointer dereferencing

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Date:   Thu, 5 Jan 2017 23:48:00 +0530
From:   Vivek Gautam <vivek.gautam@...eaurora.org>
To:     Andy Gross <andy.gross@...aro.org>
Cc:     sboyd@...eaurora.org, mturquette@...libre.com,
        david.brown@...aro.org, linux-arm-msm@...r.kernel.org,
        linux-soc@...r.kernel.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Georgi Djakov <georgi.djakov@...aro.org>
Subject: Re: [PATCH] clk: qcom: Fix a possible NULL pointer dereferencing


On 01/05/2017 07:50 PM, Andy Gross wrote:
> On Thu, Jan 05, 2017 at 02:25:25PM +0530, Vivek Gautam wrote:
>> Assign num_parents as 0 while registering fixed rate clocks
>> in _qcom_cc_register_board_clk(), to make sure the clk framework
>> doesn't dereference parent.
>>
>> Fixes: ee15faffef11 ("clk: qcom: common: Add API to register board clocks backwards compatibly")
>>
>> Cc: Georgi Djakov<georgi.djakov@...aro.org>
>> Signed-off-by: Vivek Gautam<vivek.gautam@...eaurora.org>
>> ---
>>
>> Based on 'clk-next'. Build tested.
>>
>>   drivers/clk/qcom/common.c | 1 +
>>   1 file changed, 1 insertion(+)
>>
>> diff --git a/drivers/clk/qcom/common.c b/drivers/clk/qcom/common.c
>> index cfab7b400381..df004ead1bef 100644
>> --- a/drivers/clk/qcom/common.c
>> +++ b/drivers/clk/qcom/common.c
>> @@ -157,6 +157,7 @@ static int _qcom_cc_register_board_clk(struct device *dev, const char *path,
>>   
>>   		init_data.name = path;
>>   		init_data.ops = &clk_fixed_rate_ops;
>> +		init_data.num_parents = 0;
> It seems like there was a initializer in the declaration but it was { } instead
> of { 0 }.
>
> Was the original intent to make this structure initialized to 0?  If so, perhaps
> it should be fixed above in the initializer.

yes, i think we intend to initialize the clock init data to 0, and thus
we should do that during declaration.
Will modify and re-spin the patch.


Regards
Vivek

>>   
>>   		ret = devm_clk_hw_register(dev, &fixed->hw);
>>   		if (ret)
> Regards,
>
> Andy
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