linux-kernel - Re: [PATCH] media: ttpci: fix two memleaks in budget_av

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Date: Wed, 14 Feb 2024 10:27:51 +0100
From: Hans Verkuil <hverkuil-cisco@...all.nl>
To: Zhipeng Lu <alexious@....edu.cn>
Cc: Mauro Carvalho Chehab <mchehab@...nel.org>, Yu Zhe <yuzhe@...china.com>,
 Jakub Kicinski <kuba@...nel.org>, linux-media@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH] media: ttpci: fix two memleaks in budget_av_attach

On 06/02/2024 08:37, Zhipeng Lu wrote:
> When saa7146_register_device and saa7146_vv_init fails, budget_av_attach
> should free the resources it allocates, like the error-handling of
> ttpci_budget_init does. Besides, there are two fixme comment refers to
> such deallocations.
> 
> Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
> Signed-off-by: Zhipeng Lu <alexious@....edu.cn>
> ---
>  drivers/media/pci/ttpci/budget-av.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/media/pci/ttpci/budget-av.c b/drivers/media/pci/ttpci/budget-av.c
> index 230b104a7cdf..4f897f848581 100644
> --- a/drivers/media/pci/ttpci/budget-av.c
> +++ b/drivers/media/pci/ttpci/budget-av.c
> @@ -1463,7 +1463,8 @@ static int budget_av_attach(struct saa7146_dev *dev, struct saa7146_pci_extensio
>  		budget_av->has_saa7113 = 1;
>  		err = saa7146_vv_init(dev, &vv_data);
>  		if (err != 0) {
> -			/* fixme: proper cleanup here */
> +			ttpci_budget_deinit(&budget_av->budget);
> +			kfree(budget_av);
>  			ERR("cannot init vv subsystem\n");
>  			return err;
>  		}
> @@ -1472,7 +1473,8 @@ static int budget_av_attach(struct saa7146_dev *dev, struct saa7146_pci_extensio
>  		vv_data.vid_ops.vidioc_s_input = vidioc_s_input;
>  
>  		if ((err = saa7146_register_device(&budget_av->vd, dev, "knc1", VFL_TYPE_VIDEO))) {
> -			/* fixme: proper cleanup here */
> +			ttpci_budget_deinit(&budget_av->budget);
> +			kfree(budget_av);
I think this should go after the saa7146_vv_release() release below.
Just in case saa7146_vv_release() relies on budget_av somewhere. And
besides, it is good practice to release resources in the reverse order
they were allocated.

Regards,

	Hans

>  			ERR("cannot register capture v4l2 device\n");
>  			saa7146_vv_release(dev);
>  			return err;