linux-kernel - Re: [PATCH v2, 2/2] media: mediatek: vcodec: make sure pointer isn't NULL before used

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Date:   Tue, 11 Apr 2023 07:38:17 +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>,
        Yunfei Dong (董云飞) 
        <Yunfei.Dong@...iatek.com>,
        "hverkuil-cisco@...all.nl" <hverkuil-cisco@...all.nl>
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>
Subject: Re: [PATCH v2, 2/2] media: mediatek: vcodec: make sure pointer isn't
 NULL before used

Dear Yunfei,

Thanks for your reviewing.

On Tue, 2023-04-11 at 07:22 +0000, Yunfei Dong (董云飞) wrote:
> Hi Irui,
> 
> On Tue, 2023-04-11 at 13:54 +0800, Irui Wang wrote:
> > CERT-C Expression check:
> > Dereferencing buf, which is known to be NULL, check buf is not NULL
> > before used.
> > 
> 
> Whether 'dereferencing buf' is one kind of CERT-C Expression check?
> You can re-write commit message and subject.
> 
> CERT-C Expression check (Dereferencing buf):
no, 'buf' is the used variable name, this coverity is 'Dereference null
return value(NULL RETURNS)' .
> Making sure the pointer is not NULL before to be used.
> 
> Best Regards,
> Yunfei Dong

Thanks
Best Regards
> > Signed-off-by: Irui Wang <irui.wang@...iatek.com>
> > ---
> >  drivers/media/platform/mediatek/vcodec/mtk_vcodec_enc.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> > diff --git
> > a/drivers/media/platform/mediatek/vcodec/mtk_vcodec_enc.c
> > b/drivers/media/platform/mediatek/vcodec/mtk_vcodec_enc.c
> > index d65800a3b89d..db65e77bd373 100644
> > --- a/drivers/media/platform/mediatek/vcodec/mtk_vcodec_enc.c
> > +++ b/drivers/media/platform/mediatek/vcodec/mtk_vcodec_enc.c
> > @@ -943,7 +943,7 @@ static int vb2ops_venc_start_streaming(struct
> > vb2_queue *q, unsigned int count)
> >  		 * FIXME: This check is not needed as only active
> > buffers
> >  		 * can be marked as done.
> >  		 */
> > -		if (buf->state == VB2_BUF_STATE_ACTIVE) {
> > +		if (buf && buf->state == VB2_BUF_STATE_ACTIVE) {
> >  			mtk_v4l2_debug(0, "[%d] id=%d, type=%d, %d ->
> > VB2_BUF_STATE_QUEUED",
> >  					ctx->id, i, q->type,
> >  					(int)buf->state);