linux-kernel - Re: [PATCH v2] ceph: fix memory in MDS client cap

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Message-ID: <9385a27a-da34-4bb3-96a4-9e54f5273d0c@redhat.com>
Date: Mon, 19 Aug 2024 18:33:20 +0800
From: Xiubo Li <xiubli@...hat.com>
To: "Luis Henriques (SUSE)" <luis.henriques@...ux.dev>,
 Ilya Dryomov <idryomov@...il.com>, Milind Changire <mchangir@...hat.com>
Cc: ceph-devel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] ceph: fix memory in MDS client cap_auths


On 8/19/24 17:52, Luis Henriques (SUSE) wrote:
> The cap_auths that are allocated during an MDS session opening are never
> released, causing a memory leak detected by kmemleak.  Fix this by freeing
> the memory allocated when shutting down the mds client.
>
> Fixes: 1d17de9534cb ("ceph: save cap_auths in MDS client when session is opened")
> Signed-off-by: Luis Henriques (SUSE) <luis.henriques@...ux.dev>
> ---
> Changes since v1:
>   * dropped mdsc->mutex locking as we don't need it at this point
>
>   fs/ceph/mds_client.c | 12 ++++++++++++
>   1 file changed, 12 insertions(+)
>
> diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c
> index 276e34ab3e2c..2e4b3ee7446c 100644
> --- a/fs/ceph/mds_client.c
> +++ b/fs/ceph/mds_client.c
> @@ -6015,6 +6015,18 @@ static void ceph_mdsc_stop(struct ceph_mds_client *mdsc)
>   		ceph_mdsmap_destroy(mdsc->mdsmap);
>   	kfree(mdsc->sessions);
>   	ceph_caps_finalize(mdsc);
> +
> +	if (mdsc->s_cap_auths) {
> +		int i;
> +
> +		for (i = 0; i < mdsc->s_cap_auths_num; i++) {
> +			kfree(mdsc->s_cap_auths[i].match.gids);
> +			kfree(mdsc->s_cap_auths[i].match.path);
> +			kfree(mdsc->s_cap_auths[i].match.fs_name);
> +		}
> +		kfree(mdsc->s_cap_auths);
> +	}
> +
>   	ceph_pool_perm_destroy(mdsc);
>   }
>   

LGTM.

Reviewed-by: Xiubo Li <xiubli@...hat.com>

Will apply to the testing branch and run the tests.

Thanks Luis

- Xiubo