linux-kernel - Re: [PATCH] vfs: use kstrdup()

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Date:	Mon, 21 Jul 2008 12:44:43 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Li Zefan <lizf@...fujitsu.com>
Cc:	Al Viro <viro@...IV.linux.org.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] vfs: use kstrdup()

[Li Zefan - Mon, Jul 21, 2008 at 04:28:17PM +0800]
| Cyrill Gorcunov wrote:
| > [Al Viro - Mon, Jul 21, 2008 at 08:03:46AM +0100]
| > | 
| > [...]
| > | The right thing here is to consider failing allocation of ->mnt_devname
| > | as failure of the entire alloc.
| > | 
| > 
| > Al, what about the patch below? I'm not sure if Li's version already
| > in someone tree so it's from-the-scratch. If this ok, i think Li could
| > update his version and resend.
| > 
| 
| It's already in -mm tree, but Andrew can drop it and queue the new one.
| 
| > 		- Cyrill -
| > ---
| > 
| > Index: linux-2.6.git/fs/namespace.c
| > ===================================================================
| > --- linux-2.6.git.orig/fs/namespace.c	2008-07-21 11:34:37.000000000 +0400
| > +++ linux-2.6.git/fs/namespace.c	2008-07-21 12:00:01.000000000 +0400
| > @@ -112,9 +112,13 @@ struct vfsmount *alloc_vfsmnt(const char
| >  		int err;
| >  
| >  		err = mnt_alloc_id(mnt);
| > -		if (err) {
| > -			kmem_cache_free(mnt_cache, mnt);
| > -			return NULL;
| > +		if (err)
| > +			goto err;
| > +
| > +		if (name) {
| > +			mnt->mnt_devname = kstrdup(name, GFP_KERNEL);
| > +			if (!mnt->mnt_devname)
| 
| should call mnt_free_id() here.
| 
| > +				goto err;
| >  		}
| >  
| >  		atomic_set(&mnt->mnt_count, 1);
| > @@ -127,16 +131,12 @@ struct vfsmount *alloc_vfsmnt(const char
| >  		INIT_LIST_HEAD(&mnt->mnt_slave_list);
| >  		INIT_LIST_HEAD(&mnt->mnt_slave);
| >  		atomic_set(&mnt->__mnt_writers, 0);
| > -		if (name) {
| > -			int size = strlen(name) + 1;
| > -			char *newname = kmalloc(size, GFP_KERNEL);
| > -			if (newname) {
| > -				memcpy(newname, name, size);
| > -				mnt->mnt_devname = newname;
| > -			}
| > -		}
| >  	}
| >  	return mnt;
| > +
| > +err:
| > +	kmem_cache_free(mnt_cache, mnt);
| > +	return NULL;
| >  }
| >  
| >  /*
| > 
| > 
|

well, as only Al find new version more or less correct we could
update yours.
 
		- Cyrill -
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