linux-kernel - Re: [PATCH] staging: greybus: audio: Add missing unlock in gbaudio_dapm_free

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Message-ID: <5614008b-69b8-c37f-ddb9-7497862eb8bc@huawei.com>
Date:   Sat, 5 Dec 2020 18:44:00 +0800
From:   "wanghai (M)" <wanghai38@...wei.com>
To:     Vaibhav Agarwal <vaibhav.sr@...il.com>,
        Johan Hovold <johan@...nel.org>
CC:     Alex Elder <elder@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Dan Carpenter <dan.carpenter@...cle.com>,
        <aibhav.sr@...il.com>,
        "moderated list:GREYBUS SUBSYSTEM" <greybus-dev@...ts.linaro.org>,
        <devel@...verdev.osuosl.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] staging: greybus: audio: Add missing unlock in
 gbaudio_dapm_free_controls()


在 2020/12/5 2:02, Vaibhav Agarwal 写道:
> On Fri, Dec 4, 2020 at 2:10 PM Johan Hovold <johan@...nel.org> wrote:
>> On Fri, Dec 04, 2020 at 10:13:50AM +0800, Wang Hai wrote:
>>> Add the missing unlock before return from function
>>> gbaudio_dapm_free_controls() in the error handling case.
>>>
>>> Fixes: 510e340efe0c ("staging: greybus: audio: Add helper APIs for dynamic audio module")
>>> Reported-by: Hulk Robot <hulkci@...wei.com>
>>> Signed-off-by: Wang Hai <wanghai38@...wei.com>
>>> ---
>>>   drivers/staging/greybus/audio_helper.c | 1 +
>>>   1 file changed, 1 insertion(+)
>>>
>>> diff --git a/drivers/staging/greybus/audio_helper.c b/drivers/staging/greybus/audio_helper.c
>>> index 237531ba60f3..293675dbea10 100644
>>> --- a/drivers/staging/greybus/audio_helper.c
>>> +++ b/drivers/staging/greybus/audio_helper.c
>>> @@ -135,6 +135,7 @@ int gbaudio_dapm_free_controls(struct snd_soc_dapm_context *dapm,
>>>                if (!w) {
>>>                        dev_err(dapm->dev, "%s: widget not found\n",
>>>                                widget->name);
>>> +                     mutex_unlock(&dapm->card->dapm_mutex);
>>>                        return -EINVAL;
>>>                }
>>>                widget++;
>> This superficially looks correct, but there seems to be another bug in
>> this function. It can be used free an array of widgets, but if one of
>> them isn't found we just leak the rest. Perhaps that return should
>> rather be "widget++; continue;".
>>
>> Vaibhav?
> Thanks Wang for sharing the patch. As already pointed by Johan, this
> function indeed has another bug as well.
> Pls feel free to share the patch as suggested above.
I just sent another patch

"[PATCH] staging: greybus: audio: Fix possible leak free widgets in 
gbaudio_dapm_free_controls"

> Johan
> .
>