linux-kernel - Re: [PATCH 1/1] pinctrl: canaan: k230: Fix NULL pointer dereference in device tree parsing

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Message-ID: <aVFVGnU7g6xst7Wo@duge-virtual-machine>
Date: Mon, 29 Dec 2025 00:04:42 +0800
From: Jiayu Du <jiayu.riscv@...c.iscas.ac.cn>
To: linusw@...nel.org
Cc: pjw@...nel.org, palmer@...belt.com, aou@...s.berkeley.edu,
	alex@...ti.fr, linux-gpio@...r.kernel.org,
	linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
	gaohan@...as.ac.cn, me@...ao.cc
Subject: Re: [PATCH 1/1] pinctrl: canaan: k230: Fix NULL pointer dereference
 in device tree parsing

On Sun, Dec 28, 2025 at 04:50:05PM +0800, Jiayu Du wrote:
> When probing the k230 pinctrl driver, the kernel triggers a NULL pointer
> dereference. The crash trace showed:
> [    0.732084] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000068
> [    0.740737] ...
> [    0.776296] epc : k230_pinctrl_probe+0x1be/0x4fc
> 
> In k230_pinctrl_parse_functions(), we attempt to retrieve
> the device pointer via info->pctl_dev->dev, but info->pctl_dev is only
> initialized after k230_pinctrl_parse_dt() completes.
> At the time of DT parsing, info->pctl_dev is still NULL, leading to the invalid
> dereference of info->pctl_dev->dev.
> 
> Use the already available device pointer from platform_device
> instead of accessing through uninitialized pctl_dev.
> 
> Signed-off-by: Jiayu Du <jiayu.riscv@...c.iscas.ac.cn>
Please ignore this patch. I'm sorry, I forgot to add the "fixes" tag.

I have resubmitted this patch. The link is provided here[1].

[1]: https://lore.kernel.org/all/20251228154947.194684-1-jiayu.riscv@isrc.iscas.ac.cn/