linux-kernel - Re: [PATCH 2/2] media: mediatek: vcodec: Handle encoder vsi NULL pointer case

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Message-ID: <b7c19673-a3bd-449a-9e84-49a68c89b0ea@xs4all.nl>
Date:   Thu, 5 Oct 2023 10:43:18 +0200
From:   Hans Verkuil <hverkuil-cisco@...all.nl>
To:     Irui Wang <irui.wang@...iatek.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        angelogioacchino.delregno@...labora.com,
        nicolas.dufresne@...labora.com,
        Yunfei Dong <yunfei.dong@...iatek.com>
Cc:     Project_Global_Chrome_Upstream_Group@...iatek.com,
        linux-media@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org,
        Maoguang Meng <maoguang.meng@...iatek.com>
Subject: Re: [PATCH 2/2] media: mediatek: vcodec: Handle encoder vsi NULL
 pointer case

On 26/09/2023 12:19, Irui Wang wrote:
> There will be a kernel null pointer exception if 'vsi' is NULL, check
> 'vsi' is not NULL before assign it to encoder instance.
> 
> Signed-off-by: Irui Wang <irui.wang@...iatek.com>
> ---
>  .../platform/mediatek/vcodec/encoder/venc/venc_h264_if.c     | 5 +++++
>  .../platform/mediatek/vcodec/encoder/venc/venc_vp8_if.c      | 5 +++++
>  2 files changed, 10 insertions(+)
> 
> diff --git a/drivers/media/platform/mediatek/vcodec/encoder/venc/venc_h264_if.c b/drivers/media/platform/mediatek/vcodec/encoder/venc/venc_h264_if.c
> index a68dac72c4e4..385bcc0d14f3 100644
> --- a/drivers/media/platform/mediatek/vcodec/encoder/venc/venc_h264_if.c
> +++ b/drivers/media/platform/mediatek/vcodec/encoder/venc/venc_h264_if.c
> @@ -597,6 +597,11 @@ static int h264_enc_init(struct mtk_vcodec_enc_ctx *ctx)
>  	inst->hw_base = mtk_vcodec_get_reg_addr(inst->ctx->dev->reg_base, VENC_SYS);
>  
>  	ret = vpu_enc_init(&inst->vpu_inst);
> +	if (!inst->vpu_inst.vsi) {
> +		mtk_venc_err(ctx, "share buffer is NULL");
> +		kfree(inst);
> +		return -EFAULT;
> +	}

Shouldn't this check be done in vpu_enc_init?

It looks weird that a function can return 0, but there is still an
error that needs to be checked manually afterwards.

Regards,

	Hans

>  
>  	if (MTK_ENC_IOVA_IS_34BIT(ctx))
>  		inst->vsi_34 = (struct venc_h264_vsi_34 *)inst->vpu_inst.vsi;
> diff --git a/drivers/media/platform/mediatek/vcodec/encoder/venc/venc_vp8_if.c b/drivers/media/platform/mediatek/vcodec/encoder/venc/venc_vp8_if.c
> index 05abca91e742..23ca0d93324f 100644
> --- a/drivers/media/platform/mediatek/vcodec/encoder/venc/venc_vp8_if.c
> +++ b/drivers/media/platform/mediatek/vcodec/encoder/venc/venc_vp8_if.c
> @@ -326,6 +326,11 @@ static int vp8_enc_init(struct mtk_vcodec_enc_ctx *ctx)
>  	inst->hw_base = mtk_vcodec_get_reg_addr(inst->ctx->dev->reg_base, VENC_LT_SYS);
>  
>  	ret = vpu_enc_init(&inst->vpu_inst);
> +	if (!inst->vpu_inst.vsi) {
> +		mtk_venc_err(ctx, "share buffer is NULL");
> +		kfree(inst);
> +		return -EFAULT;
> +	}
>  
>  	inst->vsi = (struct venc_vp8_vsi *)inst->vpu_inst.vsi;
>