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[PATCH] i40e: fix memcpy with swapped arguments

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  [PATCH] i40e: fix memcpy with swapped arguments Colin King <colin.king@canonical.com> - 2017-03-20 15:50 +0100
    RE: [Intel-wired-lan] [PATCH] i40e: fix memcpy with swapped  arguments "Keller, Jacob E" <jacob.e.keller@intel.com> - 2017-03-21 00:40 +0100

#1604655 — [PATCH] i40e: fix memcpy with swapped arguments

From: Colin Ian King <colin.king@canonical.com>

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.

Detected with static analysis by cppcheck

Fixes: 0ef2d5afb12d ("i40e: KISS the client interface")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
---
 drivers/net/ethernet/intel/i40e/i40e_client.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/intel/i40e/i40e_client.c b/drivers/net/ethernet/intel/i40e/i40e_client.c
index a9f0d22a7cf4..191580ed946d 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_client.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_client.c
@@ -147,7 +147,7 @@ void i40e_notify_client_of_l2_param_changes(struct i40e_vsi *vsi)
 		dev_dbg(&vsi->back->pdev->dev, "Client is not open, abort l2 param change\n");
 		return;
 	}
-	memcpy(&cdev->lan_info.params, &params, sizeof(struct i40e_params));
+	memcpy(&params, &cdev->lan_info.params, sizeof(struct i40e_params));
 	cdev->client->ops->l2_param_change(&cdev->lan_info, cdev->client,
 					   &params);
 }
-- 
2.11.0

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#1605200 — RE: [Intel-wired-lan] [PATCH] i40e: fix memcpy with swapped arguments

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

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