netdev - RE: [Intel-wired-lan] [PATCH v2 iwl-net 2/3] ice: Don't process extts if PTP is disabled

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Message-ID: <CYYPR11MB84297DAD3012B096DFDA1FC4BDD52@CYYPR11MB8429.namprd11.prod.outlook.com>
Date: Tue, 25 Jun 2024 07:08:01 +0000
From: "Pucha, HimasekharX Reddy" <himasekharx.reddy.pucha@...el.com>
To: "Kolacinski, Karol" <karol.kolacinski@...el.com>,
	"intel-wired-lan@...ts.osuosl.org" <intel-wired-lan@...ts.osuosl.org>
CC: "Keller, Jacob E" <jacob.e.keller@...el.com>, "netdev@...r.kernel.org"
	<netdev@...r.kernel.org>, "Kolacinski, Karol" <karol.kolacinski@...el.com>,
	"Nguyen, Anthony L" <anthony.l.nguyen@...el.com>, "Kitszel, Przemyslaw"
	<przemyslaw.kitszel@...el.com>
Subject: RE: [Intel-wired-lan] [PATCH v2 iwl-net 2/3] ice: Don't process extts
 if PTP is disabled

> -----Original Message-----
> From: Intel-wired-lan <intel-wired-lan-bounces@...osl.org> On Behalf Of Karol Kolacinski
> Sent: Thursday, June 20, 2024 5:57 PM
> To: intel-wired-lan@...ts.osuosl.org
> Cc: Keller, Jacob E <jacob.e.keller@...el.com>; netdev@...r.kernel.org; Kolacinski, Karol <karol.kolacinski@...el.com>; Nguyen, Anthony L <anthony.l.nguyen@...el.com>; Kitszel, Przemyslaw <przemyslaw.kitszel@...el.com>
> Subject: [Intel-wired-lan] [PATCH v2 iwl-net 2/3] ice: Don't process extts if PTP is disabled
>
> From: Jacob Keller <jacob.e.keller@...el.com>
>
> The ice_ptp_extts_event() function can race with ice_ptp_release() and result in a NULL pointer dereference which leads to a kernel panic.
>
> Panic occurs because the ice_ptp_extts_event() function calls
> ptp_clock_event() with a NULL pointer. The ice driver has already released the PTP clock by the time the interrupt for the next external timestamp event occurs.
>
> To fix this, modify the ice_ptp_extts_event() function to check the PTP state and bail early if PTP is not ready.
>
> Fixes: 172db5f91d5f ("ice: add support for auxiliary input/output pins")
> Reviewed-by: Przemek Kitszel <przemyslaw.kitszel@...el.com>
> Signed-off-by: Jacob Keller <jacob.e.keller@...el.com>
> Signed-off-by: Karol Kolacinski <karol.kolacinski@...el.com>
> ---
> V1 -> V2: removed unnecessary hunk of code and adjusted commit message
>
>  drivers/net/ethernet/intel/ice/ice_ptp.c | 4 ++++
>  1 file changed, 4 insertions(+)
>

Tested-by: Pucha Himasekhar Reddy <himasekharx.reddy.pucha@...el.com> (A Contingent worker at Intel)