linux-kernel - Re: [PATCH v2] vcodec: mediatek: add check for NULL for

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Message-ID: <df2676f0e4dce565d483ce2149b2c54da05b34a5.camel@collabora.com>
Date:   Thu, 03 Nov 2022 12:17:17 -0400
From:   Nicolas Dufresne <nicolas.dufresne@...labora.com>
To:     Anastasia Belova <abelova@...ralinux.ru>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>
Cc:     Tiffany Lin <tiffany.lin@...iatek.com>,
        Andrew-CT Chen <andrew-ct.chen@...iatek.com>,
        Yunfei Dong <yunfei.dong@...iatek.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, lvc-project@...uxtesting.org
Subject: Re: [PATCH v2] vcodec: mediatek: add check for NULL for

Le mercredi 02 novembre 2022 à 15:10 +0300, Anastasia Belova a écrit :
> Any time calling vp9_is_sf_ref_fb we need fb != NULL after checks.
> 
> Found by Linux Verification Center (linuxtesting.org) with SVACE.
> 
> Fixes: f77e89854b3e ("[media] vcodec: mediatek: Add Mediatek VP9 Video Decoder Driver")

As Angelo said, this change is a no-op in practice, for this reason I would
suggest to drop the `Fixes` tag (not worth the effort of back-porting this).

> 
> Signed-off-by: Anastasia Belova <abelova@...ralinux.ru>

Reviewed-by: Nicolas Dufresne <nicolas.dufresne@...labora.com>

> ---
>  drivers/media/platform/mediatek/vcodec/vdec/vdec_vp9_if.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/media/platform/mediatek/vcodec/vdec/vdec_vp9_if.c b/drivers/media/platform/mediatek/vcodec/vdec/vdec_vp9_if.c
> index 70b8383f7c8e..776468cd834a 100644
> --- a/drivers/media/platform/mediatek/vcodec/vdec/vdec_vp9_if.c
> +++ b/drivers/media/platform/mediatek/vcodec/vdec/vdec_vp9_if.c
> @@ -208,6 +208,9 @@ static bool vp9_is_sf_ref_fb(struct vdec_vp9_inst *inst, struct vdec_fb *fb)
>  	int i;
>  	struct vdec_vp9_vsi *vsi = inst->vsi;
>  
> +	if (!fb)
> +		return true;
> +
>  	for (i = 0; i < ARRAY_SIZE(vsi->sf_ref_fb); i++) {
>  		if (fb == &vsi->sf_ref_fb[i].fb)
>  			return true;