linux-kernel - Re: [PATCH 01/06] 9p: fix fid refcount leak in v9fs_vfs_atomic_open

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Date:   Tue, 14 Jun 2022 15:17:46 +0200
From:   Christian Schoenebeck <linux_oss@...debyte.com>
To:     Tyler Hicks <tyhicks@...ux.microsoft.com>,
        Eric Van Hensbergen <ericvh@...il.com>,
        Latchesar Ionkov <lucho@...kov.net>,
        Dominique Martinet <asmadeus@...ewreck.org>,
        Jianyong Wu <jianyong.wu@....com>,
        Dominique Martinet <asmadeus@...ewreck.org>
Cc:     v9fs-developer@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Subject: Re: [PATCH 01/06] 9p: fix fid refcount leak in v9fs_vfs_atomic_open_dotl

On Sonntag, 12. Juni 2022 10:53:24 CEST Dominique Martinet wrote:
> We need to release directory fid if we fail halfway through open
> 
> This fixes fid leaking with xfstests generic 531
> 
> Fixes: 6636b6dcc3db ("9p: add refcount to p9_fid struct")
> Cc: stable@...r.kernel.org
> Reported-by: Tyler Hicks <tyhicks@...ux.microsoft.com>
> Signed-off-by: Dominique Martinet <asmadeus@...ewreck.org>

Reviewed-by: Christian Schoenebeck <linux_oss@...debyte.com>

> ---
>  fs/9p/vfs_inode_dotl.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/fs/9p/vfs_inode_dotl.c b/fs/9p/vfs_inode_dotl.c
> index d17502a738a9..b6eb1160296c 100644
> --- a/fs/9p/vfs_inode_dotl.c
> +++ b/fs/9p/vfs_inode_dotl.c
> @@ -274,6 +274,7 @@ v9fs_vfs_atomic_open_dotl(struct inode *dir, struct
> dentry *dentry, if (IS_ERR(ofid)) {
>  		err = PTR_ERR(ofid);
>  		p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
> +		p9_client_clunk(dfid);
>  		goto out;
>  	}
> 
> @@ -285,6 +286,7 @@ v9fs_vfs_atomic_open_dotl(struct inode *dir, struct
> dentry *dentry, if (err) {
>  		p9_debug(P9_DEBUG_VFS, "Failed to get acl values in creat %d\n",
>  			 err);
> +		p9_client_clunk(dfid);
>  		goto error;
>  	}
>  	err = p9_client_create_dotl(ofid, name, v9fs_open_to_dotl_flags(flags),
> @@ -292,6 +294,7 @@ v9fs_vfs_atomic_open_dotl(struct inode *dir, struct
> dentry *dentry, if (err < 0) {
>  		p9_debug(P9_DEBUG_VFS, "p9_client_open_dotl failed in creat %d\n",
>  			 err);
> +		p9_client_clunk(dfid);
>  		goto error;
>  	}
>  	v9fs_invalidate_inode_attr(dir);