linux-kernel - [PATCH] 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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Date:   Fri, 28 Oct 2022 12:25:16 +0300
From:   Anastasia Belova <abelova@...ralinux.ru>
To:     Vinod Koul <vkoul@...nel.org>
Cc:     Anastasia Belova <abelova@...ralinux.ru>,
        dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org,
        lvc-project@...uxtesting.org
Subject: [PATCH] vdec_vp9_if: 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.

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