linux-kernel - Re: [PATCH] cifs: fix erroneous return value

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Message-ID: <1455127186.3333.44.camel@perches.com>
Date:	Wed, 10 Feb 2016 09:59:46 -0800
From:	Joe Perches <joe@...ches.com>
To:	Anton Protopopov <a.s.protopopov@...il.com>,
	Steve French <sfrench@...ba.org>
Cc:	linux-cifs@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] cifs: fix erroneous return value

On Wed, 2016-02-10 at 12:50 -0500, Anton Protopopov wrote:
> The setup_ntlmv2_rsp() function may return positive value ENOMEM instead
> of -ENOMEM in case of kmalloc failure.

How have you verified this change is correct?

Have you checked that the callers of this function in
fs/cifs/sess.c do the appropriate things with with a
negative return value?

The return value is now set into a struct member variable
as a positive value,

	sess_data->result = rc;

Have you checked all the users of this member variable?

If you have, you should say so in the commit message.

> Signed-off-by: Anton Protopopov <a.s.protopopov@...il.com>
> ---
>  fs/cifs/cifsencrypt.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/fs/cifs/cifsencrypt.c b/fs/cifs/cifsencrypt.c
> index afa09fc..e682b36 100644
> --- a/fs/cifs/cifsencrypt.c
> +++ b/fs/cifs/cifsencrypt.c
> @@ -714,7 +714,7 @@ setup_ntlmv2_rsp(struct cifs_ses *ses, const struct nls_table *nls_cp)
>  
>  	ses->auth_key.response = kmalloc(baselen + tilen, GFP_KERNEL);
>  	if (!ses->auth_key.response) {
> -		rc = ENOMEM;
> +		rc = -ENOMEM;
>  		ses->auth_key.len = 0;
>  		goto setup_ntlmv2_rsp_ret;
>  	}