linux-kernel - Re: [PATCH] extcon: axp288: Variable "val" could be uninitialized if regmap

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Date:   Mon, 2 Sep 2019 16:23:35 -0700
From:   Yizhuo Zhai <yzhai003@....edu>
To:     Andy Shevchenko <andy.shevchenko@...il.com>
Cc:     "csong@...ucr.edu" <csong@...ucr.edu>,
        "zhiyunq@...ucr.edu" <zhiyunq@...ucr.edu>,
        MyungJoo Ham <myungjoo.ham@...sung.com>,
        Chanwoo Choi <cw00.choi@...sung.com>,
        Chen-Yu Tsai <wens@...e.org>,
        Hans de Goede <hdegoede@...hat.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] extcon: axp288: Variable "val" could be uninitialized if
 regmap_read() fails

Thanks Andy, sorry for the inconvenience, I will check the log more
carefully next time.

On Mon, Sep 2, 2019 at 3:48 PM Andy Shevchenko
<andy.shevchenko@...il.com> wrote:
>
>
>
> On Tuesday, September 3, 2019, Yizhuo <yzhai003@....edu> wrote:
>>
>> In function axp288_extcon_log_rsi(), variable "val" could be
>> uninitialized if regmap_read() fails. However, it's ued to
>> decide the control flow later in the if statement, which is
>> potentially unsafe.
>
>
> https://git.kernel.org/pub/scm/linux/kernel/git/chanwoo/extcon.git/commit/?h=extcon-next&id=d72e3dc7915fc6c54645772c13f4afc0e676c7e2
>
>>
>> Signed-off-by: Yizhuo <yzhai003@....edu>
>> ---
>>  drivers/extcon/extcon-axp288.c | 5 +++++
>>  1 file changed, 5 insertions(+)
>>
>> diff --git a/drivers/extcon/extcon-axp288.c b/drivers/extcon/extcon-axp288.c
>> index 7254852e6ec0..54116a926ab6 100644
>> --- a/drivers/extcon/extcon-axp288.c
>> +++ b/drivers/extcon/extcon-axp288.c
>> @@ -135,6 +135,11 @@ static void axp288_extcon_log_rsi(struct axp288_extcon_info *info)
>>         int ret;
>>
>>         ret = regmap_read(info->regmap, AXP288_PS_BOOT_REASON_REG, &val);
>> +       if (ret) {
>> +               dev_err(info->dev, "failed to read AXP288_PS_BOOT_REASON_REG\n");
>> +               return;
>> +       }
>> +
>>         for (i = 0, rsi = axp288_pwr_up_down_info; *rsi; rsi++, i++) {
>>                 if (val & BIT(i)) {
>>                         dev_dbg(info->dev, "%s\n", *rsi);
>> --
>> 2.17.1
>>
>
>
> --
> With Best Regards,
> Andy Shevchenko
>
>


-- 
Kind Regards,

Yizhuo Zhai

Computer Science, Graduate Student
University of California, Riverside