linux-kernel - Re: [PATCH] JFS: Free sbi memory in error path

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Date:	Tue, 13 Apr 2010 09:58:29 +0200
From:	Jan Blunck <jblunck@...e.de>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Linux-Kernel Mailinglist <linux-kernel@...r.kernel.org>,
	Dave Kleikamp <shaggy@...ux.vnet.ibm.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH] JFS: Free sbi memory in error path

On Mon, Apr 12, Andrew Morton wrote:

> On Mon, 12 Apr 2010 18:40:17 +0200
> Jan Blunck <jblunck@...e.de> wrote:
> 
> > I spotted the missing kfree() while removing the BKL.
> > 
> > Signed-off-by: Jan Blunck <jblunck@...e.de>
> > ---
> >  fs/jfs/super.c |    1 +
> >  1 files changed, 1 insertions(+), 0 deletions(-)
> > 
> > diff --git a/fs/jfs/super.c b/fs/jfs/super.c
> > index 266699d..a402b7d 100644
> > --- a/fs/jfs/super.c
> > +++ b/fs/jfs/super.c
> > @@ -457,6 +457,7 @@ static int jfs_fill_super(struct super_block *sb, void *data, int silent)
> >  
> >  	if (newLVSize) {
> >  		printk(KERN_ERR "resize option for remount only\n");
> > +		kfree(sbi);
> >  		return -EINVAL;
> >  	}
> 
> It'd be best to remove those multiple return statements so that leaks
> of this nature are less likely to be reintroduced:
> 

Of course. Thanks Andrew.

Jan

> 
> From: Jan Blunck <jblunck@...e.de>
> 
> I spotted the missing kfree() while removing the BKL.
> 
> [akpm@...ux-foundation.org: avoid multiple returns so it doesn't happen again]
> Signed-off-by: Jan Blunck <jblunck@...e.de>
> Cc: Dave Kleikamp <shaggy@...tin.ibm.com>
> Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
> ---
> 
>  fs/jfs/super.c |   13 ++++++-------
>  1 file changed, 6 insertions(+), 7 deletions(-)
> 
> diff -puN fs/jfs/super.c~jfs-free-sbi-memory-in-error-path fs/jfs/super.c
> --- a/fs/jfs/super.c~jfs-free-sbi-memory-in-error-path
> +++ a/fs/jfs/super.c
> @@ -446,10 +446,8 @@ static int jfs_fill_super(struct super_b
>  	/* initialize the mount flag and determine the default error handler */
>  	flag = JFS_ERR_REMOUNT_RO;
>  
> -	if (!parse_options((char *) data, sb, &newLVSize, &flag)) {
> -		kfree(sbi);
> -		return -EINVAL;
> -	}
> +	if (!parse_options((char *) data, sb, &newLVSize, &flag))
> +		goto out_kfree;
>  	sbi->flag = flag;
>  
>  #ifdef CONFIG_JFS_POSIX_ACL
> @@ -458,7 +456,7 @@ static int jfs_fill_super(struct super_b
>  
>  	if (newLVSize) {
>  		printk(KERN_ERR "resize option for remount only\n");
> -		return -EINVAL;
> +		goto out_kfree;
>  	}
>  
>  	/*
> @@ -478,7 +476,7 @@ static int jfs_fill_super(struct super_b
>  	inode = new_inode(sb);
>  	if (inode == NULL) {
>  		ret = -ENOMEM;
> -		goto out_kfree;
> +		goto out_unload;
>  	}
>  	inode->i_ino = 0;
>  	inode->i_nlink = 1;
> @@ -550,9 +548,10 @@ out_mount_failed:
>  	make_bad_inode(sbi->direct_inode);
>  	iput(sbi->direct_inode);
>  	sbi->direct_inode = NULL;
> -out_kfree:
> +out_unload:
>  	if (sbi->nls_tab)
>  		unload_nls(sbi->nls_tab);
> +out_kfree:
>  	kfree(sbi);
>  	return ret;
>  }
> _
> 
Regards,
	Jan

-- 
Jan Blunck <jblunck@...e.de>
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