linux-kernel - Re: [PATCH][next] clk: bcm2835: fix memork leak on unfree'd pll struct

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Message-ID: <af63f727-d579-ba2d-4fa5-142ad476e293@canonical.com>
Date:   Sat, 8 Jun 2019 23:23:20 +0100
From:   Colin Ian King <colin.king@...onical.com>
To:     Stephen Boyd <sboyd@...nel.org>, Eric Anholt <eric@...olt.net>,
        Florian Fainelli <f.fainelli@...il.com>,
        Michael Turquette <mturquette@...libre.com>,
        Ray Jui <rjui@...adcom.com>,
        Scott Branden <sbranden@...adcom.com>,
        Stefan Wahren <stefan.wahren@...e.com>,
        bcm-kernel-feedback-list@...adcom.com,
        linux-arm-kernel@...ts.infradead.org, linux-clk@...r.kernel.org,
        linux-rpi-kernel@...ts.infradead.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH][next] clk: bcm2835: fix memork leak on unfree'd pll
 struct

On 07/06/2019 20:03, Stephen Boyd wrote:
> Quoting Colin King (2019-06-07 03:45:33)
>> From: Colin Ian King <colin.king@...onical.com>
>>
>> The pll struct is being allocated but not kfree'd on an error return
>> path when devm_clk_hw_register fails.  Fix this with a kfree on pll
>> if an error occurs.
>>
>> Addresses-Coverity: ("Resource leak")
>> Fixes: b19f009d4510 ("clk: bcm2835: Migrate to clk_hw based registration and OF APIs")
> 
> I suspect this problem was there before this commit, but OK.
> 
>> Signed-off-by: Colin Ian King <colin.king@...onical.com>
>> ---
>>  drivers/clk/bcm/clk-bcm2835.c | 4 +++-
>>  1 file changed, 3 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/clk/bcm/clk-bcm2835.c b/drivers/clk/bcm/clk-bcm2835.c
>> index 770bb01f523e..90584deaf416 100644
>> --- a/drivers/clk/bcm/clk-bcm2835.c
>> +++ b/drivers/clk/bcm/clk-bcm2835.c
>> @@ -1310,8 +1310,10 @@ static struct clk_hw *bcm2835_register_pll(struct bcm2835_cprman *cprman,
>>         pll->hw.init = &init;
>>  
>>         ret = devm_clk_hw_register(cprman->dev, &pll->hw);
>> -       if (ret)
>> +       if (ret) {
>> +               kfree(pll);
>>                 return NULL;
>> +       }
>>         return &pll->hw;
>>  }
> 
> Aren't there more leaks in this driver? 
> 
I'll have a look next week.