linux-kernel - Re: [PATCH] media: vcodec: Fix potential array out-of-bounds in vb2ops_venc_queue

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Message-ID: <CAAFQd5BnfStWf-S2TSR3w-6vbsCc7DU_JirwDVOixTj_6+TENQ@mail.gmail.com>
Date:   Thu, 27 Jul 2023 10:57:44 +0900
From:   Tomasz Figa <tfiga@...omium.org>
To:     mchehab@...nel.org, Hans Verkuil <hverkuil@...all.nl>
Cc:     tiffany.lin@...iatek.com, andrew-ct.chen@...iatek.com,
        yunfei.dong@...iatek.com, matthias.bgg@...il.com,
        angelogioacchino.delregno@...labora.com,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org,
        Wei Chen <harperchen1110@...il.com>
Subject: Re: [PATCH] media: vcodec: Fix potential array out-of-bounds in vb2ops_venc_queue_setup

Hi Mauro, Hans,

On Thu, Jun 15, 2023 at 1:23 AM Tomasz Figa <tfiga@...omium.org> wrote:
>
> On Tue, Mar 28, 2023 at 6:26 PM Wei Chen <harperchen1110@...il.com> wrote:
> >
> > variable *nplanes is provided by user via system call argument. The
> > possible value of q_data->fmt->num_planes is 1-3, while the value
> > of *nplanes can be 1-8. The array access by index i can cause array
> > out-of-bounds.
> >
> > Fix this bug by checking *nplanes against the array size.
> >
> > Signed-off-by: Wei Chen <harperchen1110@...il.com>
> > ---
> >  drivers/media/platform/mediatek/vcodec/mtk_vcodec_enc.c | 2 ++
> >  1 file changed, 2 insertions(+)
> >
> > diff --git a/drivers/media/platform/mediatek/vcodec/mtk_vcodec_enc.c b/drivers/media/platform/mediatek/vcodec/mtk_vcodec_enc.c
> > index d65800a3b89d..1ea02f9136f6 100644
> > --- a/drivers/media/platform/mediatek/vcodec/mtk_vcodec_enc.c
> > +++ b/drivers/media/platform/mediatek/vcodec/mtk_vcodec_enc.c
> > @@ -821,6 +821,8 @@ static int vb2ops_venc_queue_setup(struct vb2_queue *vq,
> >                 return -EINVAL;
> >
> >         if (*nplanes) {
> > +               if (*nplanes != q_data->fmt->num_planes)
> > +                       return -EINVAL;
> >                 for (i = 0; i < *nplanes; i++)
> >                         if (sizes[i] < q_data->sizeimage[i])
> >                                 return -EINVAL;
> > --
> > 2.25.1
> >
>
> Thanks for the patch, it makes sense indeed.
>
> Reviewed-by: Tomasz Figa <tfiga@...omium.org>

Do you plan to pick this patch? Thanks.

Best regards,
Tomasz