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Message-ID: <03a5fc74-1b16-a0ee-c0a0-b45943f76bf0@huawei.com>
Date: Tue, 6 Dec 2022 17:17:33 +0800
From: Yongqiang Liu <liuyongqiang13@...wei.com>
To: Ira Weiny <ira.weiny@...el.com>
CC: <linux-kernel@...r.kernel.org>, <nvdimm@...ts.linux.dev>,
<dan.j.williams@...el.com>, <vishal.l.verma@...el.com>,
<dave.jiang@...el.com>, <akpm@...ux-foundation.org>,
<joao.m.martins@...cle.com>, <zhangxiaoxu5@...wei.com>
Subject: Re: [PATCH] dax/hmem: Fix refcount leak in dax_hmem_probe()
在 2022/12/4 4:49, Ira Weiny 写道:
> On Sat, Dec 03, 2022 at 09:58:58AM +0000, Yongqiang Liu wrote:
>> We should always call dax_region_put() whenever devm_create_dev_dax()
>> succeed or fail to avoid refcount leak of dax_region. Move the return
>> value check after dax_region_put().
> I think dax_region_put is called from dax_region_unregister() automatically on
> tear down.
Yes, Thanks for your explanation.
>> Fixes: c01044cc8191 ("ACPI: HMAT: refactor hmat_register_target_device to hmem_register_device")
> I'm also not sure how this patch is related to this fix.
>
> Ira
>
>> Signed-off-by: Yongqiang Liu <liuyongqiang13@...wei.com>
>> ---
>> drivers/dax/hmem/hmem.c | 5 ++---
>> 1 file changed, 2 insertions(+), 3 deletions(-)
>>
>> diff --git a/drivers/dax/hmem/hmem.c b/drivers/dax/hmem/hmem.c
>> index 1bf040dbc834..09f5cd7b6c8e 100644
>> --- a/drivers/dax/hmem/hmem.c
>> +++ b/drivers/dax/hmem/hmem.c
>> @@ -36,12 +36,11 @@ static int dax_hmem_probe(struct platform_device *pdev)
>> .size = region_idle ? 0 : resource_size(res),
>> };
>> dev_dax = devm_create_dev_dax(&data);
>> - if (IS_ERR(dev_dax))
>> - return PTR_ERR(dev_dax);
>>
>> /* child dev_dax instances now own the lifetime of the dax_region */
>> dax_region_put(dax_region);
>> - return 0;
>> +
>> + return IS_ERR(dev_dax) ? PTR_ERR(dev_dax) : 0;
>> }
>>
>> static int dax_hmem_remove(struct platform_device *pdev)
>> --
>> 2.25.1
>>
>>
> .
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