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Message-ID: <f08b11c7-43b7-4fe5-be36-f069527cbd69@stanley.mountain>
Date: Mon, 21 Oct 2024 10:26:22 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: oe-kbuild@...ts.linux.dev, Yunfei Dong <yunfei.dong@...iatek.com>,
Nícolas F . R . A . Prado <nfraprado@...labora.com>,
Sebastian Fricke <sebastian.fricke@...labora.com>,
Nicolas Dufresne <nicolas.dufresne@...labora.com>,
Hans Verkuil <hverkuil@...all.nl>,
AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
Benjamin Gaignard <benjamin.gaignard@...labora.com>,
Nathan Hebert <nhebert@...omium.org>,
Daniel Almeida <daniel.almeida@...labora.com>
Cc: lkp@...el.com, oe-kbuild-all@...ts.linux.dev,
Hsin-Yi Wang <hsinyi@...omium.org>,
Fritz Koenig <frkoenig@...omium.org>,
Daniel Vetter <daniel@...ll.ch>, Steve Cho <stevecho@...omium.org>,
Yunfei Dong <yunfei.dong@...iatek.com>, linux-media@...r.kernel.org,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org,
linux-mediatek@...ts.infradead.org,
Project_Global_Chrome_Upstream_Group@...iatek.com
Subject: Re: [PATCH v5 1/5] media: mediatek: vcodec: setting request complete
before buffer done
Hi Yunfei,
kernel test robot noticed the following build warnings:
https://git-scm.com/docs/git-format-patch#_base_tree_information]
url: https://github.com/intel-lab-lkp/linux/commits/Yunfei-Dong/media-mediatek-vcodec-setting-request-complete-before-buffer-done/20241012-144607
base: git://linuxtv.org/media_tree.git master
patch link: https://lore.kernel.org/r/20241012064333.27269-2-yunfei.dong%40mediatek.com
patch subject: [PATCH v5 1/5] media: mediatek: vcodec: setting request complete before buffer done
config: arm-randconfig-r072-20241016 (https://download.01.org/0day-ci/archive/20241019/202410192150.2YkqysDO-lkp@intel.com/config)
compiler: arm-linux-gnueabi-gcc (GCC) 14.1.0
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@...el.com>
| Reported-by: Dan Carpenter <dan.carpenter@...aro.org>
| Closes: https://lore.kernel.org/r/202410192150.2YkqysDO-lkp@intel.com/
smatch warnings:
drivers/media/platform/mediatek/vcodec/decoder/mtk_vcodec_dec_stateless.c:272 mtk_vdec_stateless_cap_to_disp() warn: variable dereferenced before check 'vb2_v4l2_src' (see line 268)
vim +/vb2_v4l2_src +272 drivers/media/platform/mediatek/vcodec/decoder/mtk_vcodec_dec_stateless.c
01abf5fbb081c0 drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec_stateless.c Yunfei Dong 2023-07-29 247 static void mtk_vdec_stateless_cap_to_disp(struct mtk_vcodec_dec_ctx *ctx, int error,
5c46486b8d2760 drivers/media/platform/mediatek/vcodec/decoder/mtk_vcodec_dec_stateless.c Yunfei Dong 2024-10-12 248 struct vb2_v4l2_buffer *vb2_v4l2_src)
8cdc3794b2e34b drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_stateless.c Yunfei Dong 2021-08-06 249 {
7b182b8d9c8523 drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec_stateless.c Yunfei Dong 2022-05-12 250 struct vb2_v4l2_buffer *vb2_dst;
7b182b8d9c8523 drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec_stateless.c Yunfei Dong 2022-05-12 251 enum vb2_buffer_state state;
5c46486b8d2760 drivers/media/platform/mediatek/vcodec/decoder/mtk_vcodec_dec_stateless.c Yunfei Dong 2024-10-12 252 struct media_request *src_buf_req;
8cdc3794b2e34b drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_stateless.c Yunfei Dong 2021-08-06 253
7b182b8d9c8523 drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec_stateless.c Yunfei Dong 2022-05-12 254 if (error)
7b182b8d9c8523 drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec_stateless.c Yunfei Dong 2022-05-12 255 state = VB2_BUF_STATE_ERROR;
7b182b8d9c8523 drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec_stateless.c Yunfei Dong 2022-05-12 256 else
7b182b8d9c8523 drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec_stateless.c Yunfei Dong 2022-05-12 257 state = VB2_BUF_STATE_DONE;
7b182b8d9c8523 drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec_stateless.c Yunfei Dong 2022-05-12 258
7b182b8d9c8523 drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec_stateless.c Yunfei Dong 2022-05-12 259 vb2_dst = v4l2_m2m_dst_buf_remove(ctx->m2m_ctx);
d879f770e4d1d5 drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec_stateless.c Yunfei Dong 2022-11-17 260 if (vb2_dst) {
7b182b8d9c8523 drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec_stateless.c Yunfei Dong 2022-05-12 261 v4l2_m2m_buf_done(vb2_dst, state);
41f03c673cb7b5 drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec_stateless.c Yunfei Dong 2023-07-29 262 mtk_v4l2_vdec_dbg(2, ctx, "free frame buffer id:%d to done list",
7b182b8d9c8523 drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec_stateless.c Yunfei Dong 2022-05-12 263 vb2_dst->vb2_buf.index);
d879f770e4d1d5 drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec_stateless.c Yunfei Dong 2022-11-17 264 } else {
41f03c673cb7b5 drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec_stateless.c Yunfei Dong 2023-07-29 265 mtk_v4l2_vdec_err(ctx, "dst buffer is NULL");
d879f770e4d1d5 drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec_stateless.c Yunfei Dong 2022-11-17 266 }
7b182b8d9c8523 drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec_stateless.c Yunfei Dong 2022-05-12 267
5c46486b8d2760 drivers/media/platform/mediatek/vcodec/decoder/mtk_vcodec_dec_stateless.c Yunfei Dong 2024-10-12 @268 src_buf_req = vb2_v4l2_src->vb2_buf.req_obj.req;
^^^^^^^^^^^^^^^
Dereference
7b182b8d9c8523 drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec_stateless.c Yunfei Dong 2022-05-12 269 if (src_buf_req)
7b182b8d9c8523 drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec_stateless.c Yunfei Dong 2022-05-12 270 v4l2_ctrl_request_complete(src_buf_req, &ctx->ctrl_hdl);
5c46486b8d2760 drivers/media/platform/mediatek/vcodec/decoder/mtk_vcodec_dec_stateless.c Yunfei Dong 2024-10-12 271
5c46486b8d2760 drivers/media/platform/mediatek/vcodec/decoder/mtk_vcodec_dec_stateless.c Yunfei Dong 2024-10-12 @272 if (vb2_v4l2_src)
^^^^^^^^^^^^
Checked too late
5c46486b8d2760 drivers/media/platform/mediatek/vcodec/decoder/mtk_vcodec_dec_stateless.c Yunfei Dong 2024-10-12 273 v4l2_m2m_buf_done(vb2_v4l2_src, state);
7b182b8d9c8523 drivers/media/platform/mediatek/vcodec/mtk_vcodec_dec_stateless.c Yunfei Dong 2022-05-12 274 }
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
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