linux-kernel - Re: [PATCH v2] power: sequencing: fix an invalid pointer dereference in error path

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Message-ID: <d0b079dd-28bd-4e61-9352-87f5a1b72d09@suswa.mountain>
Date: Tue, 16 Jul 2024 08:31:05 -0500
From: Dan Carpenter <dan.carpenter@...aro.org>
To: Bartosz Golaszewski <brgl@...ev.pl>
Cc: Krzysztof Kozlowski <krzk@...nel.org>, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
Subject: Re: [PATCH v2] power: sequencing: fix an invalid pointer dereference
 in error path

On Fri, Jul 12, 2024 at 09:40:04PM +0200, Bartosz Golaszewski wrote:
> From: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
> 
> We may end up calling pwrseq_target_free() on a partially initialized
> target object whose unit is either NULL or an ERR_PTR(). Avoid
> dereferencing invalid memory by adding an appropriate check to
> pwrseq_target_free().
> 
> Fixes: 249ebf3f65f8 ("power: sequencing: implement the pwrseq core")
> Reported-by: Dan Carpenter <dan.carpenter@...aro.org>
> Closes: https://lore.kernel.org/linux-pm/62a3531e-9927-40f8-b587-254a2dfa47ef@stanley.mountain/
> Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@...aro.org>
> ---
> - check for ERR_PTR() in addition to checking for NULL
> - only add the check to pwrseq_target_free() as anywhere else unit is
>   always set and if it's not then it's another bug that needs fixing
> 

Reviewed-by: Dan Carpenter <dan.carpenter@...aro.org>

regards,
dan carpenter