linux-kernel - RE: [Intel-wired-lan] [PATCH] i40e: fix memcpy with swapped arguments

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Message-ID: <02874ECE860811409154E81DA85FBB5857DAF748@ORSMSX115.amr.corp.intel.com>
Date:   Mon, 20 Mar 2017 23:33:06 +0000
From:   "Keller, Jacob E" <jacob.e.keller@...el.com>
To:     Colin King <colin.king@...onical.com>,
        "Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>,
        "intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC:     "kernel-janitors@...r.kernel.org" <kernel-janitors@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [Intel-wired-lan] [PATCH] i40e: fix memcpy with swapped
 arguments

> -----Original Message-----
> From: Intel-wired-lan [mailto:intel-wired-lan-bounces@...ts.osuosl.org] On
> Behalf Of Colin King
> Sent: Monday, March 20, 2017 7:46 AM
> To: Kirsher, Jeffrey T <jeffrey.t.kirsher@...el.com>; intel-wired-
> lan@...ts.osuosl.org; netdev@...r.kernel.org
> Cc: kernel-janitors@...r.kernel.org; linux-kernel@...r.kernel.org
> Subject: [Intel-wired-lan] [PATCH] i40e: fix memcpy with swapped arguments
> 
> From: Colin Ian King <colin.king@...onical.com>

Hi there,

> 
> The current code copies an uninitialized params into
> cdev->lan_info.params and then passes the uninitialized params
> to the call cdev->client->ops->l2_param_change.  I believe the
> order of the source and destination in the memcpy is the wrong
> way around and should be swapped.
> 

So you are correct that params is uninitialized. However, the fix here is not correct. Somehow we dropped the code for initializing the parameters.

See commit d7ce6422d6e6 ("i40e: don't check params until after checking for client instance", 2017-02-09) It looks like the commit itself was malformed when applied upstream, and a later commit which should have preserved the changes 3140aa9a78c9 ("i40e: KISS the client interface", 2017-03-14) accidentally dropped them.

I'll provide a patch to get this back into the correct state.

Thanks for catching this.

Regards,
Jake