linux-kernel - Re: [PATCH 1/1] UBIFS: fix incorrect unlocking handling

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Message-ID: <20150318031858.GO32500@ld-irv-0074>
Date:	Tue, 17 Mar 2015 20:18:58 -0700
From:	Brian Norris <computersforpeace@...il.com>
To:	Taesoo Kim <tsgatesv@...il.com>
Cc:	dedekind1@...il.com, adrian.hunter@...el.com,
	linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
	taesoo@...ech.edu, sanidhya@...ech.edu, blee@...ech.edu,
	csong84@...ech.edu, changwoo@...ech.edu,
	Subodh Nijsure <snijsure@...d-net.com>,
	Marc Kleine-Budde <mkl@...gutronix.de>,
	Ben Shelton <ben.shelton@...com>,
	Brad Mouring <brad.mouring@...com>,
	Terry Wilcox <terry.wilcox@...com>,
	Gratian Crisan <gratian.crisan@...com>
Subject: Re: [PATCH 1/1] UBIFS: fix incorrect unlocking handling

On Tue, Mar 17, 2015 at 10:09:26PM -0400, Taesoo Kim wrote:
> When ubifs_init_security() fails, 'ui_mutex' is incorrectly
> unlocked and incorrectly restores 'i_size'. There are four
> such places that were introduce by the last commit.

"The last commit" is not very descriptive. Are you speaking of this
commit?

commit d7f0b70d30ffb9bbe6b8a3e1035cf0b79965ef53
Author: Subodh Nijsure <snijsure@...d-net.com>
Date:   Fri Oct 31 13:50:30 2014 -0500

    UBIFS: Add security.* XATTR support for the UBIFS

CC'ing authors/reviewers.

Brian

> Signed-off-by: Taesoo Kim <tsgatesv@...il.com>
> ---
>  fs/ubifs/dir.c | 11 +++++++----
>  1 file changed, 7 insertions(+), 4 deletions(-)
> 
> diff --git a/fs/ubifs/dir.c b/fs/ubifs/dir.c
> index 0fa6c80..5b24bc4 100644
> --- a/fs/ubifs/dir.c
> +++ b/fs/ubifs/dir.c
> @@ -272,7 +272,7 @@ static int ubifs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
> 
>  	err = ubifs_init_security(dir, inode, &dentry->d_name);
>  	if (err)
> -		goto out_cancel;
> +		goto out_inode;
> 
>  	mutex_lock(&dir_ui->ui_mutex);
>  	dir->i_size += sz_change;
> @@ -292,6 +292,7 @@ out_cancel:
>  	dir->i_size -= sz_change;
>  	dir_ui->ui_size = dir->i_size;
>  	mutex_unlock(&dir_ui->ui_mutex);
> +out_inode:
>  	make_bad_inode(inode);
>  	iput(inode);
>  out_budg:
> @@ -732,7 +733,7 @@ static int ubifs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
> 
>  	err = ubifs_init_security(dir, inode, &dentry->d_name);
>  	if (err)
> -		goto out_cancel;
> +		goto out_inode;
> 
>  	mutex_lock(&dir_ui->ui_mutex);
>  	insert_inode_hash(inode);
> @@ -757,6 +758,7 @@ out_cancel:
>  	dir_ui->ui_size = dir->i_size;
>  	drop_nlink(dir);
>  	mutex_unlock(&dir_ui->ui_mutex);
> +out_inode:
>  	make_bad_inode(inode);
>  	iput(inode);
>  out_budg:
> @@ -816,7 +818,7 @@ static int ubifs_mknod(struct inode *dir, struct dentry *dentry,
> 
>  	err = ubifs_init_security(dir, inode, &dentry->d_name);
>  	if (err)
> -		goto out_cancel;
> +		goto out_inode;
> 
>  	mutex_lock(&dir_ui->ui_mutex);
>  	dir->i_size += sz_change;
> @@ -836,6 +838,7 @@ out_cancel:
>  	dir->i_size -= sz_change;
>  	dir_ui->ui_size = dir->i_size;
>  	mutex_unlock(&dir_ui->ui_mutex);
> +out_inode:
>  	make_bad_inode(inode);
>  	iput(inode);
>  out_budg:
> @@ -896,7 +899,7 @@ static int ubifs_symlink(struct inode *dir, struct dentry *dentry,
> 
>  	err = ubifs_init_security(dir, inode, &dentry->d_name);
>  	if (err)
> -		goto out_cancel;
> +		goto out_inode;
> 
>  	mutex_lock(&dir_ui->ui_mutex);
>  	dir->i_size += sz_change;
> --
> 2.3.3
> 
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