[PATCH 2/3] media: mediatek: vcodec: fix vp8 stateless decoder smatch warning

From: Yunfei Dong <yunfei.dong@mediatek.com>
To: "Nícolas F . R . A . Prado" <nfraprado@collabora.com>,
	"Nicolas Dufresne" <nicolas.dufresne@collabora.com>,
	"Hans Verkuil" <hverkuil-cisco@xs4all.nl>,
	"AngeloGioacchino Del Regno"
	<angelogioacchino.delregno@collabora.com>,
	"Benjamin Gaignard" <benjamin.gaignard@collabora.com>,
	"Nathan Hebert" <nhebert@chromium.org>
Cc: Hsin-Yi Wang <hsinyi@chromium.org>,
	Fritz Koenig <frkoenig@chromium.org>,
	Daniel Vetter <daniel@ffwll.ch>,
	Steve Cho <stevecho@chromium.org>,
	"Yunfei Dong" <yunfei.dong@mediatek.com>,
	<linux-media@vger.kernel.org>, <devicetree@vger.kernel.org>,
	<linux-kernel@vger.kernel.org>,
	<linux-arm-kernel@lists.infradead.org>,
	<linux-mediatek@lists.infradead.org>,
	<Project_Global_Chrome_Upstream_Group@mediatek.com>
Subject: [PATCH 2/3] media: mediatek: vcodec: fix vp8 stateless decoder smatch warning
Date: Thu, 29 Feb 2024 17:56:10 +0800	[thread overview]
Message-ID: <20240229095611.6698-3-yunfei.dong@mediatek.com> (raw)
In-Reply-To: <20240229095611.6698-1-yunfei.dong@mediatek.com>

Fix smatch static checker warning for vdec_vp8_req_if.c. Leading
to kernel crash when fb is NULL.

Fixes: 7a7ae26fd458 ("media: mediatek: vcodec: support stateless VP8 decoding")
Signed-off-by: Yunfei Dong <yunfei.dong@mediatek.com>
---
 .../mediatek/vcodec/decoder/vdec/vdec_vp8_req_if.c     | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/drivers/media/platform/mediatek/vcodec/decoder/vdec/vdec_vp8_req_if.c b/drivers/media/platform/mediatek/vcodec/decoder/vdec/vdec_vp8_req_if.c
index f677e499fefa..0889517a58e8 100644
--- a/drivers/media/platform/mediatek/vcodec/decoder/vdec/vdec_vp8_req_if.c
+++ b/drivers/media/platform/mediatek/vcodec/decoder/vdec/vdec_vp8_req_if.c
@@ -334,14 +334,18 @@ static int vdec_vp8_slice_decode(void *h_vdec, struct mtk_vcodec_mem *bs,
 	src_buf_info = container_of(bs, struct mtk_video_dec_buf, bs_buffer);
 
 	fb = inst->ctx->dev->vdec_pdata->get_cap_buffer(inst->ctx);
-	dst_buf_info = container_of(fb, struct mtk_video_dec_buf, frame_buffer);
+	if (!fb) {
+		mtk_vdec_err(inst->ctx, "fb buffer is NULL");
+		return -EBUSY;
+	}
 
-	y_fb_dma = fb ? (u64)fb->base_y.dma_addr : 0;
+	dst_buf_info = container_of(fb, struct mtk_video_dec_buf, frame_buffer);
+	y_fb_dma = (u64)fb->base_y.dma_addr;
 	if (inst->ctx->q_data[MTK_Q_DATA_DST].fmt->num_planes == 1)
 		c_fb_dma = y_fb_dma +
 			inst->ctx->picinfo.buf_w * inst->ctx->picinfo.buf_h;
 	else
-		c_fb_dma = fb ? (u64)fb->base_c.dma_addr : 0;
+		c_fb_dma = (u64)fb->base_c.dma_addr;
 
 	inst->vsi->dec.bs_dma = (u64)bs->dma_addr;
 	inst->vsi->dec.bs_sz = bs->size;
-- 
2.25.1


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