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

[Keller, Jacob E]

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

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