linux-kernel - Re: [PATCH] drm/crc-debugfs: Fix memleak in crc_control

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Date:   Wed, 19 Aug 2020 14:55:15 +0300
From:   Laurent Pinchart <laurent.pinchart@...asonboard.com>
To:     Dinghao Liu <dinghao.liu@....edu.cn>
Cc:     kjlu@....edu,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Leo Li <sunpeng.li@....com>,
        Mahesh Kumar <mahesh1.kumar@...el.com>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/crc-debugfs: Fix memleak in crc_control_write

Hi Dinghao,

Thank you for the patch.

On Wed, Aug 19, 2020 at 04:22:28PM +0800, Dinghao Liu wrote:
> When verify_crc_source() fails, source needs to be freed.
> However, current code is returning directly and ends up
> leaking memory.
> 
> Fixes: c0811a7d5befe ("drm/crc: Cleanup crtc_crc_open function")

I think the issue was introduced in d5cc15a0c66e ("drm: crc: Introduce
verify_crc_source callback"). Apart from that,

Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

> Signed-off-by: Dinghao Liu <dinghao.liu@....edu.cn>
> ---
>  drivers/gpu/drm/drm_debugfs_crc.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/drm_debugfs_crc.c b/drivers/gpu/drm/drm_debugfs_crc.c
> index 5d67a41f7c3a..3dd70d813f69 100644
> --- a/drivers/gpu/drm/drm_debugfs_crc.c
> +++ b/drivers/gpu/drm/drm_debugfs_crc.c
> @@ -144,8 +144,10 @@ static ssize_t crc_control_write(struct file *file, const char __user *ubuf,
>  		source[len - 1] = '\0';
>  
>  	ret = crtc->funcs->verify_crc_source(crtc, source, &values_cnt);
> -	if (ret)
> +	if (ret) {
> +		kfree(source);
>  		return ret;
> +	}
>  
>  	spin_lock_irq(&crc->lock);
>  

-- 
Regards,

Laurent Pinchart