linux-kernel - Re: [PATCH] ceph: quota: Fix invalid pointer access in

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Date:   Wed, 15 Nov 2023 08:35:50 +0800
From:   Xiubo Li <xiubli@...hat.com>
To:     Wenchao Hao <haowenchao2@...wei.com>,
        Ilya Dryomov <idryomov@...il.com>,
        Jeff Layton <jlayton@...nel.org>, ceph-devel@...r.kernel.org,
        linux-kernel@...r.kernel.org
Cc:     louhongxiang@...wei.com
Subject: Re: [PATCH] ceph: quota: Fix invalid pointer access in


On 11/14/23 23:31, Wenchao Hao wrote:
> This issue is reported by smatch, get_quota_realm() might return
> ERR_PTR, so we should using IS_ERR_OR_NULL here to check the return
> value.
>
> Signed-off-by: Wenchao Hao <haowenchao2@...wei.com>
> ---
>   fs/ceph/quota.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/fs/ceph/quota.c b/fs/ceph/quota.c
> index 9d36c3532de1..c4b2929c6a83 100644
> --- a/fs/ceph/quota.c
> +++ b/fs/ceph/quota.c
> @@ -495,7 +495,7 @@ bool ceph_quota_update_statfs(struct ceph_fs_client *fsc, struct kstatfs *buf)
>   	realm = get_quota_realm(mdsc, d_inode(fsc->sb->s_root),
>   				QUOTA_GET_MAX_BYTES, true);
>   	up_read(&mdsc->snap_rwsem);
> -	if (!realm)
> +	if (IS_ERR_OR_NULL(realm))
>   		return false;
>   
>   	spin_lock(&realm->inodes_with_caps_lock);

Good catch.

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

We should CC the stable mail list.

Thanks

- Xiubo