linux-kernel - Re: [PATCH v2] ceph: fix memory leak in mount error path when using test_dummy

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Message-ID: <444977b8-dbe3-1819-d4dd-b56a0a4aaf4f@redhat.com>
Date:   Wed, 9 Nov 2022 17:40:01 +0800
From:   Xiubo Li <xiubli@...hat.com>
To:     Luís Henriques <lhenriques@...e.de>
Cc:     Ilya Dryomov <idryomov@...il.com>,
        Jeff Layton <jlayton@...nel.org>, ceph-devel@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] ceph: fix memory leak in mount error path when using
 test_dummy_encryption


On 09/11/2022 17:33, Luís Henriques wrote:
> On Wed, Nov 09, 2022 at 11:08:49AM +0800, Xiubo Li wrote:
>> On 08/11/2022 22:34, Luís Henriques wrote:
>>> Because ceph_init_fs_context() will never be invoced in case we get a
>>> mount error, destroy_mount_options() won't be releasing fscrypt resources
>>> with fscrypt_free_dummy_policy().  This will result in a memory leak.  Add
>>> an invocation to this function in the mount error path.
>>>
>>> Signed-off-by: Luís Henriques <lhenriques@...e.de>
>>> ---
>>> * Changes since v1:
>>>
>>> As suggested by Xiubo, moved fscrypt free from ceph_get_tree() to
>>> ceph_real_mount().
>>>
>>> (Also used 'git format-patch' with '--base' so that the bots know what to
>>> (not) do with this patch.)
>>>
>>>    fs/ceph/super.c | 1 +
>>>    1 file changed, 1 insertion(+)
>>>
>>> diff --git a/fs/ceph/super.c b/fs/ceph/super.c
>>> index 2224d44d21c0..f10a076f47e5 100644
>>> --- a/fs/ceph/super.c
>>> +++ b/fs/ceph/super.c
>>> @@ -1196,6 +1196,7 @@ static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc,
>>>    out:
>>>    	mutex_unlock(&fsc->client->mount_mutex);
>>> +	ceph_fscrypt_free_dummy_policy(fsc);
>>>    	return ERR_PTR(err);
>>>    }
>>>
>>> base-commit: 8b9ee21dfceadd4cc35a87bbe7f0ad547cffa1be
>>> prerequisite-patch-id: 34ba9e6b37b68668d261ddbda7858ee6f83c82fa
>>> prerequisite-patch-id: 87f1b323c29ab8d0a6d012d30fdc39bc49179624
>>> prerequisite-patch-id: c94f448ef026375b10748457a3aa46070aa7046e
>>>
>> LGTM.
>>
>> Thanks Luis.
>>
>> Could I fold this into the previous commit ?
> Yes, sure.  I'm fine with that.

Thanks.

I will mentioned this fix in that commit comments.

- Xiubo


>
> Cheers,
> --
> Luís
>