netdev - RE: [net PATCH] ixgbe: Fix NULL pointer dereference in ethtool loopback test

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Message-ID: <MW3PR11MB4748FAECF13CAF958B57A9B5EB739@MW3PR11MB4748.namprd11.prod.outlook.com>
Date:   Fri, 9 Apr 2021 19:39:20 +0000
From:   "Switzer, David" <david.switzer@...el.com>
To:     Alexander Duyck <alexander.duyck@...il.com>,
        "intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>
CC:     "Brandeburg, Jesse" <jesse.brandeburg@...el.com>,
        "Nguyen, Anthony L" <anthony.l.nguyen@...el.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: [net PATCH] ixgbe: Fix NULL pointer dereference in ethtool
 loopback test


>-----Original Message-----
>From: Alexander Duyck <alexander.duyck@...il.com>
>Sent: Monday, March 8, 2021 12:42 PM
>To: intel-wired-lan@...ts.osuosl.org
>Cc: Brandeburg, Jesse <jesse.brandeburg@...el.com>; Nguyen, Anthony L
><anthony.l.nguyen@...el.com>; netdev@...r.kernel.org
>Subject: [net PATCH] ixgbe: Fix NULL pointer dereference in ethtool loopback test
>
>From: Alexander Duyck <alexanderduyck@...com>
>
>The ixgbe driver currently generates a NULL pointer dereference when
>performing the ethtool loopback test. This is due to the fact that there isn't a
>q_vector associated with the test ring when it is setup as interrupts are not
>normally added to the test rings.
>
>To address this I have added code that will check for a q_vector before returning
>a napi_id value. If a q_vector is not present it will return a value of 0.
>
>Fixes: b02e5a0ebb17 ("xsk: Propagate napi_id to XDP socket Rx path")
>Signed-off-by: Alexander Duyck <alexanderduyck@...com>
>---
> drivers/net/ethernet/intel/ixgbe/ixgbe_main.c |    9 ++++++++-
> 1 file changed, 8 insertions(+), 1 deletion(-)
>
Tested-by: Dave Switzer <david.switzer@...el.com>