linux-kernel - Re: [PATCH] befs: fix return value check in befs

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Message-ID: <CAGXu5jKRTv_xW1kbPBR+GYNDvPTb5rirFXNZjGH17Rsssh8q4A@mail.gmail.com>
Date:	Wed, 30 Oct 2013 10:52:38 -0700
From:	Kees Cook <keescook@...omium.org>
To:	Wei Yongjun <weiyj.lk@...il.com>,
	Dan Carpenter <dan.carpenter@...cle.com>
Cc:	Al Viro <viro@...iv.linux.org.uk>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Serge Hallyn <serge.hallyn@...onical.com>,
	yongjun_wei@...ndmicro.com.cn, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] befs: fix return value check in befs_iget()

On Mon, Oct 28, 2013 at 7:00 PM, Wei Yongjun <weiyj.lk@...il.com> wrote:
> From: Wei Yongjun <yongjun_wei@...ndmicro.com.cn>
>
> In case of error, the function iget_locked() returns NULL pointer
> not ERR_PTR(). The IS_ERR() test in the return value check should
> be replaced with NULL test.
>
> Signed-off-by: Wei Yongjun <yongjun_wei@...ndmicro.com.cn>

Good catch, thanks!

Acked-by: Kees Cook <keescook@...omium.org>

As an aside, Dan, how hard would this kind of mismatch be to detect with smatch?

-Kees

> ---
>  fs/befs/linuxvfs.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/fs/befs/linuxvfs.c b/fs/befs/linuxvfs.c
> index e9c75e2..d714dda 100644
> --- a/fs/befs/linuxvfs.c
> +++ b/fs/befs/linuxvfs.c
> @@ -319,8 +319,8 @@ static struct inode *befs_iget(struct super_block *sb, unsigned long ino)
>         befs_debug(sb, "---> befs_read_inode() " "inode = %lu", ino);
>
>         inode = iget_locked(sb, ino);
> -       if (IS_ERR(inode))
> -               return inode;
> +       if (!inode)
> +               return ERR_PTR(-ENOMEM);
>         if (!(inode->i_state & I_NEW))
>                 return inode;
>
>



-- 
Kees Cook
Chrome OS Security
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