netdev - Re: [PATCH 08/32] staging: wfx: simplify hif_handle_tx

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Thu, 2 Apr 2020 16:13:39 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Jerome Pouiller <Jerome.Pouiller@...abs.com>
Cc:     devel@...verdev.osuosl.org, linux-wireless@...r.kernel.org,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "David S . Miller" <davem@...emloft.net>,
        Kalle Valo <kvalo@...eaurora.org>
Subject: Re: [PATCH 08/32] staging: wfx: simplify hif_handle_tx_data()

On Wed, Apr 01, 2020 at 01:03:41PM +0200, Jerome Pouiller wrote:
> From: Jérôme Pouiller <jerome.pouiller@...abs.com>
> 
> The last argument of hif_handle_tx_data() was now unused. In add,
> hif_handle_tx_data() has nothing to do with HIF layer and should be
> renamed. Finally, it not convenient to pass a wfx_vif as parameter. It
> is easier to let hif_handle_tx_data() find the interface itself.
> 
> Signed-off-by: Jérôme Pouiller <jerome.pouiller@...abs.com>
> ---
>  drivers/staging/wfx/queue.c | 19 ++++++++++---------
>  1 file changed, 10 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/staging/wfx/queue.c b/drivers/staging/wfx/queue.c
> index 2553f77522d9..8647731e02c0 100644
> --- a/drivers/staging/wfx/queue.c
> +++ b/drivers/staging/wfx/queue.c
> @@ -319,13 +319,17 @@ bool wfx_tx_queues_is_empty(struct wfx_dev *wdev)
>  	return ret;
>  }
>  
> -static bool hif_handle_tx_data(struct wfx_vif *wvif, struct sk_buff *skb,
> -			       struct wfx_queue *queue)
> +static bool wfx_handle_tx_data(struct wfx_dev *wdev, struct sk_buff *skb)
>  {
>  	struct hif_req_tx *req = wfx_skb_txreq(skb);
>  	struct ieee80211_key_conf *hw_key = wfx_skb_tx_priv(skb)->hw_key;
>  	struct ieee80211_hdr *frame =
>  		(struct ieee80211_hdr *)(req->frame + req->data_flags.fc_offset);
> +	struct wfx_vif *wvif =
> +		wdev_to_wvif(wdev, ((struct hif_msg *)skb->data)->interface);
                                                      ^^^^^^^^^
This is on the TX side so it's probably okay, but one problem I have
noticed is that we do this on the RX side as well with checking that

	if (skb->len < sizeof(struct hif_msg))
		return -EINVAL;

So we could be reading beyond the end of the skb.  If we got really
unlucky it could lead to an Oops.

regards,
dan carpenter