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Subject: Re: [PATCH] ceph: Fix NULL vs IS_ERR checking in ceph_getattr
To:     Miaoqian Lin <linmq006@gmail.com>,
        Ilya Dryomov <idryomov@gmail.com>,
        Jeff Layton <jlayton@kernel.org>, ceph-devel@vger.kernel.org,
        linux-kernel@vger.kernel.org
References: <20221110031311.1629288-1-linmq006@gmail.com>
From:   Xiubo Li <xiubli@redhat.com>
Message-ID: <67a1782c-9b7d-055a-5e62-456294cb4401@redhat.com>
Date:   Thu, 10 Nov 2022 13:44:56 +0800
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Hi Miaoqian,

Thanks for your patch. This has already been fixed by Dan Carpenter 
weeks ago and already in the ceph-client's testing branch, please see [1]:

[1] 
https://github.com/ceph/ceph-client/commit/ffc4d66a34bb5bd76d0a3f83bebf500d96a8e37c

BRs

- Xiubo

On 10/11/2022 11:13, Miaoqian Lin wrote:
> The ceph_lookup_inode() function return error pointers on error
> instead of NULL.
> Use IS_ERR() to check the return value to fix this.
>
> Fixes: aa87052dd965 ("ceph: fix incorrectly showing the .snap size for stat")
> Signed-off-by: Miaoqian Lin <linmq006@gmail.com>
> ---
>   fs/ceph/inode.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c
> index 4af5e55abc15..bad9eeb6a1a5 100644
> --- a/fs/ceph/inode.c
> +++ b/fs/ceph/inode.c
> @@ -2492,7 +2492,7 @@ int ceph_getattr(struct user_namespace *mnt_userns, const struct path *path,
>   			struct inode *parent;
>   
>   			parent = ceph_lookup_inode(sb, ceph_ino(inode));
> -			if (!parent)
> +			if (IS_ERR(parent))
>   				return PTR_ERR(parent);
>   
>   			pci = ceph_inode(parent);