linux-kernel - Re: [patch] security: testing the wrong variable in create_by

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Date:	Thu, 22 Apr 2010 21:18:55 +1000 (EST)
From:	James Morris <jmorris@...ei.org>
To:	Dan Carpenter <error27@...il.com>
cc:	Eric Paris <eparis@...hat.com>, linux-kernel@...r.kernel.org,
	kernel-janitors@...r.kernel.org,
	linux-security-module@...r.kernel.org
Subject: Re: [patch] security: testing the wrong variable in
 create_by_name()

On Thu, 22 Apr 2010, Dan Carpenter wrote:

> There is a typo here.  We should be testing "*dentry" instead of
> "dentry".  If "*dentry" is an ERR_PTR, it gets dereferenced in either
> mkdir() or create() which would cause an OOPs.
> 
> Signed-off-by: Dan Carpenter <error27@...il.com>

Looks correct -- queued for Linus.


> 
> diff --git a/security/inode.c b/security/inode.c
> index c3a7938..1c812e8 100644
> --- a/security/inode.c
> +++ b/security/inode.c
> @@ -161,13 +161,13 @@ static int create_by_name(const char *name, mode_t mode,
>  
>  	mutex_lock(&parent->d_inode->i_mutex);
>  	*dentry = lookup_one_len(name, parent, strlen(name));
> -	if (!IS_ERR(dentry)) {
> +	if (!IS_ERR(*dentry)) {
>  		if ((mode & S_IFMT) == S_IFDIR)
>  			error = mkdir(parent->d_inode, *dentry, mode);
>  		else
>  			error = create(parent->d_inode, *dentry, mode);
>  	} else
> -		error = PTR_ERR(dentry);
> +		error = PTR_ERR(*dentry);
>  	mutex_unlock(&parent->d_inode->i_mutex);
>  
>  	return error;
> 

-- 
James Morris
<jmorris@...ei.org>
--
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