[PATCH 6.10 352/634] media: mediatek: vcodec: Fix H264 multi stateless decoder smatch warning

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6.10-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Yunfei Dong <yunfei.dong@xxxxxxxxxxxx>

[ Upstream commit 9be85491619f1953b8a29590ca630be571941ffa ]

Fix a smatch static checker warning on vdec_h264_req_multi_if.c.
Which leads to a kernel crash when fb is NULL.

Fixes: 397edc703a10 ("media: mediatek: vcodec: add h264 decoder driver for mt8186")
Signed-off-by: Yunfei Dong <yunfei.dong@xxxxxxxxxxxx>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@xxxxxxxxxxxxx>
Signed-off-by: Sebastian Fricke <sebastian.fricke@xxxxxxxxxxxxx>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 .../vcodec/decoder/vdec/vdec_h264_req_multi_if.c         | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/media/platform/mediatek/vcodec/decoder/vdec/vdec_h264_req_multi_if.c b/drivers/media/platform/mediatek/vcodec/decoder/vdec/vdec_h264_req_multi_if.c
index 2d4611e7fa0b2..1ed0ccec56655 100644
--- a/drivers/media/platform/mediatek/vcodec/decoder/vdec/vdec_h264_req_multi_if.c
+++ b/drivers/media/platform/mediatek/vcodec/decoder/vdec/vdec_h264_req_multi_if.c
@@ -724,11 +724,16 @@ static int vdec_h264_slice_single_decode(void *h_vdec, struct mtk_vcodec_mem *bs
 		return vpu_dec_reset(vpu);
 
 	fb = inst->ctx->dev->vdec_pdata->get_cap_buffer(inst->ctx);
+	if (!fb) {
+		mtk_vdec_err(inst->ctx, "fb buffer is NULL");
+		return -ENOMEM;
+	}
+
 	src_buf_info = container_of(bs, struct mtk_video_dec_buf, bs_buffer);
 	dst_buf_info = container_of(fb, struct mtk_video_dec_buf, frame_buffer);
 
-	y_fb_dma = fb ? (u64)fb->base_y.dma_addr : 0;
-	c_fb_dma = fb ? (u64)fb->base_c.dma_addr : 0;
+	y_fb_dma = fb->base_y.dma_addr;
+	c_fb_dma = fb->base_c.dma_addr;
 	mtk_vdec_debug(inst->ctx, "[h264-dec] [%d] y_dma=%llx c_dma=%llx",
 		       inst->ctx->decoded_frame_cnt, y_fb_dma, c_fb_dma);
 
-- 
2.43.0







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