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

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Date: Fri, 21 Jun 2024 12:06:50 +0100
From: Simon Horman <horms@...nel.org>
To: Karol Kolacinski <karol.kolacinski@...el.com>
Cc: intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org,
	anthony.l.nguyen@...el.com, przemyslaw.kitszel@...el.com,
	Jacob Keller <jacob.e.keller@...el.com>
Subject: Re: [PATCH v2 iwl-net 2/3] ice: Don't process extts if PTP is
 disabled

On Thu, Jun 20, 2024 at 02:27:09PM +0200, Karol Kolacinski wrote:
> 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

Thanks for the update.

Reviewed-by: Simon Horman <horms@...nel.org>