linux-kernel - Re: [PATCH 5.10 1/1] vdec_vp9_if: add check for NULL for vsi->frm_bufs[vsi->new_fb_idx].buf.fb in vp9_swap_frm

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Message-ID: <Y1uwD66oqzLGufuq@kroah.com>
Date:   Fri, 28 Oct 2022 12:33:51 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Anastasia Belova <abelova@...ralinux.ru>
Cc:     Tiffany Lin <tiffany.lin@...iatek.com>,
        Andrew-CT Chen <andrew-ct.chen@...iatek.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>,
        linux-media@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, linux-kernel@...r.kernel.org,
        lvc-project@...uxtesting.org
Subject: Re: [PATCH 5.10 1/1] vdec_vp9_if: add check for NULL for
 vsi->frm_bufs[vsi->new_fb_idx].buf.fb in vp9_swap_frm_bufs

On Fri, Oct 28, 2022 at 01:05:39PM +0300, Anastasia Belova wrote:
> If vsi->frm_bufs[vsi->new_fb_idx].buf.fb == NULL while cleaning
> fb_free_list NULL-pointer is dereferenced.
> 
> Found by Linux Verification Center (linuxtesting.org) with SVACE.
> 
> Signed-off-by: Anastasia Belova <abelova@...ralinux.ru>
> ---
>  drivers/media/platform/mtk-vcodec/vdec/vdec_vp9_if.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/media/platform/mtk-vcodec/vdec/vdec_vp9_if.c b/drivers/media/platform/mtk-vcodec/vdec/vdec_vp9_if.c
> index d9880210b2ab..dea056689b48 100644
> --- a/drivers/media/platform/mtk-vcodec/vdec/vdec_vp9_if.c
> +++ b/drivers/media/platform/mtk-vcodec/vdec/vdec_vp9_if.c
> @@ -512,7 +512,7 @@ static void vp9_swap_frm_bufs(struct vdec_vp9_inst *inst)
>  	 * clean fb_free_list
>  	 */
>  	if (vsi->frm_bufs[vsi->new_fb_idx].ref_cnt == 0) {
> -		if (!vp9_is_sf_ref_fb(
> +		if (vsi->frm_bufs[vsi->new_fb_idx].buf.fb != NULL && !vp9_is_sf_ref_fb(
>  			inst, vsi->frm_bufs[vsi->new_fb_idx].buf.fb)) {
>  			struct vdec_fb *fb;
>  
> -- 
> 2.30.2
> 

<formletter>

This is not the correct way to submit patches for inclusion in the
stable kernel tree.  Please read:
    https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html
for how to do this properly.

</formletter>