linux-kernel - Re: [PATCH 1/2] media: mediatek: vcodec: Fix encoder access NULL pointer

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Date:   Sat, 7 Oct 2023 01:49:13 +0000
From:   Irui Wang (王瑞) <Irui.Wang@...iatek.com>
To:     "matthias.bgg@...il.com" <matthias.bgg@...il.com>,
        "mchehab@...nel.org" <mchehab@...nel.org>,
        "angelogioacchino.delregno@...labora.com" 
        <angelogioacchino.delregno@...labora.com>,
        "nicolas.dufresne@...labora.com" <nicolas.dufresne@...labora.com>,
        "hverkuil-cisco@...all.nl" <hverkuil-cisco@...all.nl>,
        Yunfei Dong (董云飞) 
        <Yunfei.Dong@...iatek.com>
CC:     "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
        "linux-mediatek@...ts.infradead.org" 
        <linux-mediatek@...ts.infradead.org>,
        Maoguang Meng (孟毛广) 
        <Maoguang.Meng@...iatek.com>,
        Project_Global_Chrome_Upstream_Group 
        <Project_Global_Chrome_Upstream_Group@...iatek.com>,
        "devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH 1/2] media: mediatek: vcodec: Fix encoder access NULL
 pointer

Dear Hans,

Sorry for late response, we have just returned to office after
vacation. Yes, it's a fix and thank you very much for accepting it.

Best Regards

On Thu, 2023-10-05 at 10:46 +0200, Hans Verkuil wrote:
>  	 
> External email : Please do not click links or open attachments until
> you have verified the sender or the content.
>  On 04/10/2023 08:54, Hans Verkuil wrote:
> > Ping! Is this a fix for 6.6 or not?
> > 
> > Regards,
> > 
> > Hans
> > 
> > On 02/10/2023 12:24, Hans Verkuil wrote:
> >> On 26/09/2023 12:19, Irui Wang wrote:
> >>> Need to set the private data with encoder device, or will access
> >>> NULL pointer in encoder handler.
> >>>
> >>> Fixes: 1972e32431ed ("media: mediatek: vcodec: Fix possible
> invalid memory access for encoder")
> >>>
> >>> Signed-off-by: Irui Wang <irui.wang@...iatek.com>
> >>> ---
> >>>  drivers/media/platform/mediatek/vcodec/encoder/venc_vpu_if.c | 3
> ++-
> >>>  1 file changed, 2 insertions(+), 1 deletion(-)
> >>>
> >>> diff --git
> a/drivers/media/platform/mediatek/vcodec/encoder/venc_vpu_if.c
> b/drivers/media/platform/mediatek/vcodec/encoder/venc_vpu_if.c
> >>> index d299cc2962a5..ae6290d28f8e 100644
> >>> ---
> a/drivers/media/platform/mediatek/vcodec/encoder/venc_vpu_if.c
> >>> +++
> b/drivers/media/platform/mediatek/vcodec/encoder/venc_vpu_if.c
> >>> @@ -138,7 +138,8 @@ int vpu_enc_init(struct venc_vpu_inst *vpu)
> >>>  vpu->ctx->vpu_inst = vpu;
> >>>  
> >>>  status = mtk_vcodec_fw_ipi_register(vpu->ctx->dev->fw_handler,
> vpu->id,
> >>> -    vpu_enc_ipi_handler, "venc", NULL);
> >>> +    vpu_enc_ipi_handler, "venc",
> >>> +    vpu->ctx->dev);
> >>>  
> >>>  if (status) {
> >>>  mtk_venc_err(vpu->ctx, "vpu_ipi_register fail %d", status);
> >>
> >> Is this a fix that should go to 6.6?
> 
> This looks like a real bug, so I'll queue this up for 6.6.
> 
> Regards,
> 
> Hans