linux-kernel - Re: [PATCH 2/3] fs: nfsd: remove calls to simple

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Date:	Sat, 26 Oct 2013 14:41:24 -0400
From:	"J. Bruce Fields" <bfields@...ldses.org>
To:	Daniel Walker <dwalker@...o99.com>
Cc:	linux-nfs@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] fs: nfsd: remove calls to simple_strtoll

On Fri, Oct 25, 2013 at 07:33:12PM -0700, Daniel Walker wrote:
> Signed-off-by: Daniel Walker <dwalker@...o99.com>
> ---
>  fs/nfsd/fault_inject.c | 12 ++++++++----
>  1 file changed, 8 insertions(+), 4 deletions(-)
> 
> diff --git a/fs/nfsd/fault_inject.c b/fs/nfsd/fault_inject.c
> index d620e7f..41165f0 100644
> --- a/fs/nfsd/fault_inject.c
> +++ b/fs/nfsd/fault_inject.c
> @@ -125,20 +125,24 @@ static ssize_t fault_inject_write(struct file *file, const char __user *buf,
>  	size_t size = min(sizeof(write_buf) - 1, len);
>  	struct net *net = current->nsproxy->net_ns;
>  	struct sockaddr_storage sa;
> +	int ret = -EFAULT;
>  	u64 val;
>  
>  	if (copy_from_user(write_buf, buf, size))
> -		return -EFAULT;
> +		return ret;
>  	write_buf[size] = '\0';
>  
>  	size = rpc_pton(net, write_buf, size, (struct sockaddr *)&sa, sizeof(sa));
>  	if (size > 0)
>  		nfsd_inject_set_client(file_inode(file)->i_private, &sa, size);

If we take this branch, don't we end up returning -EFAULT below?

--b.

>  	else {
> -		val = simple_strtoll(write_buf, NULL, 0);
> -		nfsd_inject_set(file_inode(file)->i_private, val);
> +		ret = kstrtoll(write_buf, 0, &val);
> +		if (ret == 0) {
> +			nfsd_inject_set(file_inode(file)->i_private, val);
> +			ret = len;
> +		}
>  	}
> -	return len; /* on success, claim we got the whole input */
> +	return ret; /* on success, claim we got the whole input */
>  }
>  
>  static const struct file_operations fops_nfsd = {
> -- 
> 1.8.3.2
> 
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