linux-kernel - Re: [PATCH] stm class: Add a missing call to put

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Message-ID: <336d516d-a256-fd70-1c08-8c42880a2821@gmail.com>
Date:   Mon, 21 Nov 2016 08:58:55 +0100
From:   Quentin Lambert <lambert.quentin@...il.com>
To:     Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] stm class: Add a missing call to put_device



On 11/21/2016 08:32 AM, Alexander Shishkin wrote:
> Quentin Lambert <lambert.quentin@...il.com> writes:
>
>> Most error branches following the call to class_find_device contain
>> a call to put_device. This patch add calls to put_device where
>> they are missing.
>>
>> This issue was found with Hector.
>>
>> Signed-off-by: Quentin Lambert <lambert.quentin@...il.com>
>>
>> ---
>>   drivers/hwtracing/stm/core.c |    4 +++-
>>   1 file changed, 3 insertions(+), 1 deletion(-)
>>
>> --- a/drivers/hwtracing/stm/core.c
>> +++ b/drivers/hwtracing/stm/core.c
>> @@ -368,8 +368,10 @@ static int stm_char_open(struct inode *i
>>   		return -ENODEV;
>>   
>>   	stmf = kzalloc(sizeof(*stmf), GFP_KERNEL);
>> -	if (!stmf)
>> +	if (!stmf) {
>> +		put_device(dev);
>>   		return -ENOMEM;
>> +	}
> There is a goto label at the bottom of this function which is supposed
>   to deal with this. See the fix that we already have [1] for this issue.
>
> [1] https://git.kernel.org/cgit/linux/kernel/git/ash/stm.git/commit/?h=stm-for-greg-20161118&id=a0ebf519b8a2666438d999c62995618c710573e5
>
> Regards,
> --
> alex
Your fix is better, you are right, I did not use the goto label because 
of the free.

Thanks for your feedback though.

Regards,
Quentin