linux-kernel - Re: [PATCH v2] ptp: ocp: Fix NULL dereference in Adva board SMA sysfs operations

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Message-ID: <2d86bf48-6588-4051-8eb8-30bd4e1a34ca@linux.dev>
Date: Wed, 30 Apr 2025 10:54:20 +0100
From: Vadim Fedorenko <vadim.fedorenko@...ux.dev>
To: Sagi Maimon <maimon.sagi@...il.com>, jonathan.lemon@...il.com,
 richardcochran@...il.com, andrew+netdev@...n.ch, davem@...emloft.net,
 edumazet@...gle.com, kuba@...nel.org, pabeni@...hat.com
Cc: linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
 Sagi Maimon <sagi.maimon@...ran.com>
Subject: Re: [PATCH v2] ptp: ocp: Fix NULL dereference in Adva board SMA sysfs
 operations

On 29/04/2025 08:33, Sagi Maimon wrote:
> From: Sagi Maimon <sagi.maimon@...ran.com>
> 
> On Adva boards, SMA sysfs store/get operations can call
> __handle_signal_outputs() or __handle_signal_inputs() while the `irig`
> and `dcf` pointers are uninitialized, leading to a NULL pointer
> dereference in __handle_signal() and causing a kernel crash. Adva boards
> don't use `irig` or `dcf` functionality, so add Adva-specific callbacks
> `ptp_ocp_sma_adva_set_outputs()` and `ptp_ocp_sma_adva_set_inputs()` that
> avoid invoking `irig` or `dcf` input/output routines.
> 
> Fixes: ef61f5528fca ("ptp: ocp: add Adva timecard support")
> Signed-off-by: Sagi Maimon <maimon.sagi@...il.com>
> ---
> Addressed comments from Vadim Fedorenko:
>   - https://www.spinics.net/lists/kernel/msg5659845.html
> Changes since v1:
>   - Remove unused `irig` and `dcf` code.
> ---
> ---
>   drivers/ptp/ptp_ocp.c | 52 +++++++++++++++++++++++++++++++++++++++++--
>   1 file changed, 50 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/ptp/ptp_ocp.c b/drivers/ptp/ptp_ocp.c
> index faf6e027f89a..2ccdca4f6960 100644
> --- a/drivers/ptp/ptp_ocp.c
> +++ b/drivers/ptp/ptp_ocp.c
> @@ -2578,12 +2578,60 @@ static const struct ocp_sma_op ocp_fb_sma_op = {
>   	.set_output	= ptp_ocp_sma_fb_set_output,
>   };
>   
> +static int
> +ptp_ocp_sma_adva_set_output(struct ptp_ocp *bp, int sma_nr, u32 val)
> +{
> +	u32 reg, mask, shift;
> +	unsigned long flags;
> +	u32 __iomem *gpio;
> +
> +	gpio = sma_nr > 2 ? &bp->sma_map1->gpio2 : &bp->sma_map2->gpio2;
> +	shift = sma_nr & 1 ? 0 : 16;
> +
> +	mask = 0xffff << (16 - shift);
> +
> +	spin_lock_irqsave(&bp->lock, flags);
> +
> +	reg = ioread32(gpio);
> +	reg = (reg & mask) | (val << shift);
> +
> +	iowrite32(reg, gpio);
> +
> +	spin_unlock_irqrestore(&bp->lock, flags);
> +
> +	return 0;
> +}
> +
> +static int
> +ptp_ocp_sma_adva_set_inputs(struct ptp_ocp *bp, int sma_nr, u32 val)
> +{
> +	u32 reg, mask, shift;
> +	unsigned long flags;
> +	u32 __iomem *gpio;
> +
> +	gpio = sma_nr > 2 ? &bp->sma_map2->gpio1 : &bp->sma_map1->gpio1;
> +	shift = sma_nr & 1 ? 0 : 16;
> +
> +	mask = 0xffff << (16 - shift);
> +
> +	spin_lock_irqsave(&bp->lock, flags);
> +
> +	reg = ioread32(gpio);
> +	reg = (reg & mask) | (val << shift);
> +
> +	iowrite32(reg, gpio);
> +
> +	spin_unlock_irqrestore(&bp->lock, flags);
> +
> +	return 0;
> +}
> +
>   static const struct ocp_sma_op ocp_adva_sma_op = {
>   	.tbl		= { ptp_ocp_adva_sma_in, ptp_ocp_adva_sma_out },
>   	.init		= ptp_ocp_sma_fb_init,
>   	.get		= ptp_ocp_sma_fb_get,
> -	.set_inputs	= ptp_ocp_sma_fb_set_inputs,
> -	.set_output	= ptp_ocp_sma_fb_set_output,
> +	.set_inputs	= ptp_ocp_sma_adva_set_inputs,
> +	.set_output	= ptp_ocp_sma_adva_set_output,
>   };
>   
>   static int

LGTM,
Reviewed-by: Vadim Fedorenko <vadim.fedorenko@...ux.dev>