linux-kernel - [PATCH] vcodec: mediatek: add check for NULL for vsi->frm_bufs[vsi->new_fb_idx].buf.fb in vp9_swap_frm

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Date:   Fri, 28 Oct 2022 15:58:11 +0300
From:   Anastasia Belova <abelova@...ralinux.ru>
To:     Mauro Carvalho Chehab <mchehab@...nel.org>,
        Matthias Brugger <matthias.bgg@...il.com>
Cc:     Anastasia Belova <abelova@...ralinux.ru>,
        Tiffany Lin <tiffany.lin@...iatek.com>,
        Andrew-CT Chen <andrew-ct.chen@...iatek.com>,
        Yunfei Dong <yunfei.dong@...iatek.com>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Nicolas Dufresne <nicolas.dufresne@...labora.com>,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-mediatek@...ts.infradead.org, lvc-project@...uxtesting.org
Subject: [PATCH] vcodec: mediatek: add check for NULL for  vsi->frm_bufs[vsi->new_fb_idx].buf.fb in vp9_swap_frm_bufs

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.

Fixes: f77e89854b3e ("[media] vcodec: mediatek: Add Mediatek VP9 Video Decoder Driver")

Signed-off-by: Anastasia Belova <abelova@...ralinux.ru>
---
 drivers/media/platform/mediatek/vcodec/vdec/vdec_vp9_if.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/media/platform/mediatek/vcodec/vdec/vdec_vp9_if.c b/drivers/media/platform/mediatek/vcodec/vdec/vdec_vp9_if.c
index 70b8383f7c8e..b0679aaf6192 100644
--- a/drivers/media/platform/mediatek/vcodec/vdec/vdec_vp9_if.c
+++ b/drivers/media/platform/mediatek/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