linux-kernel - Re: [PATCH v2] drm/sti: avoid potential dereference of error pointers

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Message-ID: <20240924074734.GB463025@gnbcxd0016.gnb.st.com>
Date: Tue, 24 Sep 2024 09:47:34 +0200
From: Alain Volmat <alain.volmat@...s.st.com>
To: Ma Ke <make24@...as.ac.cn>
CC: <maarten.lankhorst@...ux.intel.com>, <mripard@...nel.org>,
        <tzimmermann@...e.de>, <airlied@...il.com>, <daniel@...ll.ch>,
        <vincent.abriou@...com>, <benjamin.gaignard@...aro.org>,
        <dri-devel@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>,
        <stable@...r.kernel.org>, <alain.volmat@...s.st.com>
Subject: Re: [PATCH v2] drm/sti: avoid potential dereference of error pointers

Hi,

On Fri, Sep 13, 2024 at 05:04:12PM +0800, Ma Ke wrote:
> The return value of drm_atomic_get_crtc_state() needs to be
> checked. To avoid use of error pointer 'crtc_state' in case
> of the failure.
> 
> Cc: stable@...r.kernel.org
> Fixes: dd86dc2f9ae1 ("drm/sti: implement atomic_check for the planes")
> Signed-off-by: Ma Ke <make24@...as.ac.cn>
> ---
> Changes in v2:
> - modified the Fixes tag according to suggestions;
> - added necessary blank line.
> ---
>  drivers/gpu/drm/sti/sti_cursor.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/gpu/drm/sti/sti_cursor.c b/drivers/gpu/drm/sti/sti_cursor.c
> index db0a1eb53532..c59fcb4dca32 100644
> --- a/drivers/gpu/drm/sti/sti_cursor.c
> +++ b/drivers/gpu/drm/sti/sti_cursor.c
> @@ -200,6 +200,9 @@ static int sti_cursor_atomic_check(struct drm_plane *drm_plane,
>  		return 0;
>  
>  	crtc_state = drm_atomic_get_crtc_state(state, crtc);
> +	if (IS_ERR(crtc_state))
> +		return PTR_ERR(crtc_state);
> +
>  	mode = &crtc_state->mode;
>  	dst_x = new_plane_state->crtc_x;
>  	dst_y = new_plane_state->crtc_y;
> -- 
> 2.25.1
> 

Thanks, patch applied.

Regards,
Alain