linux-kernel - Re: [PATCH net] ptp: Ensure info->enable callback is always set

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Message-ID: <Z5JZlU-MPc01eDnU@hoboy.vegasvil.org>
Date: Thu, 23 Jan 2025 07:00:37 -0800
From: Richard Cochran <richardcochran@...il.com>
To: Thomas Weißschuh <linux@...ssschuh.net>
Cc: Andrew Lunn <andrew+netdev@...n.ch>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>,
	John Stultz <john.stultz@...aro.org>, Arnd Bergmann <arnd@...db.de>,
	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Subject: Re: [PATCH net] ptp: Ensure info->enable callback is always set

On Wed, Jan 22, 2025 at 07:39:31PM +0100, Thomas Weißschuh wrote:
> The ioctl and sysfs handlers unconditionally call the ->enable callback.
> Not all drivers implement that callback, leading to NULL dereferences.
> Example of affected drivers: ptp_s390.c, ptp_vclock.c and ptp_mock.c.
> 
> Instead use a dummy callback if no better was specified by the driver.
> 
> Fixes: d94ba80ebbea ("ptp: Added a brand new class driver for ptp clocks.")
> Cc: stable@...r.kernel.org
> Signed-off-by: Thomas Weißschuh <linux@...ssschuh.net>

Acked-by: Richard Cochran <richardcochran@...il.com>