linux-kernel - RE: Re: [PATCH] scsi: ufs: ufshpb: Fix possible memory leak

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Date:   Mon, 23 Aug 2021 10:09:12 +0900
From:   Keoseong Park <keosung.park@...sung.com>
To:     Bart Van Assche <bvanassche@....org>,
        Keoseong Park <keosung.park@...sung.com>,
        ALIM AKHTAR <alim.akhtar@...sung.com>,
        "avri.altman@....com" <avri.altman@....com>,
        "jejb@...ux.ibm.com" <jejb@...ux.ibm.com>,
        "martin.petersen@...cle.com" <martin.petersen@...cle.com>,
        Daejun Park <daejun7.park@...sung.com>,
        "beanhuo@...ron.com" <beanhuo@...ron.com>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: Re: [PATCH] scsi: ufs: ufshpb: Fix possible memory leak

Hi Bart,

> On 8/19/21 6:46 PM, Keoseong Park wrote:
>> When HPB pinned region exists and mctx allocation for this region fails,
>> memory leak is possible because memory is not released for the subregion
>> table of the current region.
>> 
>> So, change to free memory for the subregion table of the current region.
>> 
>> Signed-off-by: Keoseong Park <keosung.park@...sung.com>
>> ---
>>   drivers/scsi/ufs/ufshpb.c | 5 ++++-
>>   1 file changed, 4 insertions(+), 1 deletion(-)
>> 
>> diff --git a/drivers/scsi/ufs/ufshpb.c b/drivers/scsi/ufs/ufshpb.c
>> index 9acce92a356b..052f584c789a 100644
>> --- a/drivers/scsi/ufs/ufshpb.c
>> +++ b/drivers/scsi/ufs/ufshpb.c
>> @@ -1933,7 +1933,7 @@ static int ufshpb_alloc_region_tbl(struct ufs_hba *hba, struct ufshpb_lu *hpb)
>>   		if (ufshpb_is_pinned_region(hpb, rgn_idx)) {
>>   			ret = ufshpb_init_pinned_active_region(hba, hpb, rgn);
>>   			if (ret)
>> -				goto release_srgn_table;
>> +				goto release_current_srgn_table;
>>   		} else {
>>   			rgn->rgn_state = HPB_RGN_INACTIVE;
>>   		}
>> @@ -1944,6 +1944,9 @@ static int ufshpb_alloc_region_tbl(struct ufs_hba *hba, struct ufshpb_lu *hpb)
>>   
>>   	return 0;
>>   
>> +release_current_srgn_table:
>> +	kvfree(rgn_table[rgn_idx].srgn_tbl);
>> +
>>   release_srgn_table:
>>   	for (i = 0; i < rgn_idx; i++)
>>   		kvfree(rgn_table[i].srgn_tbl);
>
>'rgn_table' is allocated with kvcalloc() so please merge the new kvfree() statement
>with the for-loop below it.
>
>There is another improvement that can be made in this function: hpb->rgn_tbl
>is not cleared in the error path. I propose to move the "hpb->rgn_tbl = rgn_table"
>assignment from the start of the function to just above the "return 0" statement.
>
>Thanks,
>
>Bart.
>

Thank you for your feedback.
I will fix it.

Best Regards,
Keoseong