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Subjectdrivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_wb.c:261 dpu_encoder_phys_wb_atomic_check() warn: variable dereferenced before check 'conn_state' (see line 255)
tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 4b35035bcf80ddb47c0112c4fbd84a63a2836a18
commit: d7d0e73f7de33a2b9998b607707a3e944ef3b86d drm/msm/dpu: introduce the dpu_encoder_phys_* for writeback
config: ia64-randconfig-m031-20220616 (https://download.01.org/0day-ci/archive/20220619/202206190637.iURVxsik-lkp@intel.com/config)
compiler: ia64-linux-gcc (GCC) 11.3.0

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@intel.com>
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>

New smatch warnings:
drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_wb.c:261 dpu_encoder_phys_wb_atomic_check() warn: variable dereferenced before check 'conn_state' (see line 255)

Old smatch warnings:
drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_wb.c:252 dpu_encoder_phys_wb_atomic_check() error: potentially dereferencing uninitialized 'mode'.

vim +/conn_state +261 drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_wb.c

d7d0e73f7de33a Abhinav Kumar 2022-04-26 244 static int dpu_encoder_phys_wb_atomic_check(
d7d0e73f7de33a Abhinav Kumar 2022-04-26 245 struct dpu_encoder_phys *phys_enc,
d7d0e73f7de33a Abhinav Kumar 2022-04-26 246 struct drm_crtc_state *crtc_state,
d7d0e73f7de33a Abhinav Kumar 2022-04-26 247 struct drm_connector_state *conn_state)
d7d0e73f7de33a Abhinav Kumar 2022-04-26 248 {
d7d0e73f7de33a Abhinav Kumar 2022-04-26 249 struct drm_framebuffer *fb;
d7d0e73f7de33a Abhinav Kumar 2022-04-26 250 const struct drm_display_mode *mode;
d7d0e73f7de33a Abhinav Kumar 2022-04-26 251
d7d0e73f7de33a Abhinav Kumar 2022-04-26 252 DPU_DEBUG("[atomic_check:%d, \"%s\",%d,%d]\n",
d7d0e73f7de33a Abhinav Kumar 2022-04-26 253 phys_enc->wb_idx, mode->name, mode->hdisplay, mode->vdisplay);
d7d0e73f7de33a Abhinav Kumar 2022-04-26 254
d7d0e73f7de33a Abhinav Kumar 2022-04-26 @255 if (!conn_state->writeback_job || !conn_state->writeback_job->fb)
^^^^^^^^^^^^ ^^^^^^^^^^^^
Dereferences

d7d0e73f7de33a Abhinav Kumar 2022-04-26 256 return 0;
d7d0e73f7de33a Abhinav Kumar 2022-04-26 257
d7d0e73f7de33a Abhinav Kumar 2022-04-26 258 fb = conn_state->writeback_job->fb;
d7d0e73f7de33a Abhinav Kumar 2022-04-26 259 mode = &crtc_state->mode;
d7d0e73f7de33a Abhinav Kumar 2022-04-26 260
d7d0e73f7de33a Abhinav Kumar 2022-04-26 @261 if (!conn_state || !conn_state->connector) {
^^^^^^^^^^^
Checked too late

d7d0e73f7de33a Abhinav Kumar 2022-04-26 262 DPU_ERROR("invalid connector state\n");
d7d0e73f7de33a Abhinav Kumar 2022-04-26 263 return -EINVAL;
d7d0e73f7de33a Abhinav Kumar 2022-04-26 264 } else if (conn_state->connector->status !=
d7d0e73f7de33a Abhinav Kumar 2022-04-26 265 connector_status_connected) {
d7d0e73f7de33a Abhinav Kumar 2022-04-26 266 DPU_ERROR("connector not connected %d\n",
d7d0e73f7de33a Abhinav Kumar 2022-04-26 267 conn_state->connector->status);
d7d0e73f7de33a Abhinav Kumar 2022-04-26 268 return -EINVAL;
d7d0e73f7de33a Abhinav Kumar 2022-04-26 269 }
d7d0e73f7de33a Abhinav Kumar 2022-04-26 270
d7d0e73f7de33a Abhinav Kumar 2022-04-26 271 DPU_DEBUG("[fb_id:%u][fb:%u,%u]\n", fb->base.id,
d7d0e73f7de33a Abhinav Kumar 2022-04-26 272 fb->width, fb->height);
d7d0e73f7de33a Abhinav Kumar 2022-04-26 273
d7d0e73f7de33a Abhinav Kumar 2022-04-26 274 if (fb->width != mode->hdisplay) {
d7d0e73f7de33a Abhinav Kumar 2022-04-26 275 DPU_ERROR("invalid fb w=%d, mode w=%d\n", fb->width,
d7d0e73f7de33a Abhinav Kumar 2022-04-26 276 mode->hdisplay);
d7d0e73f7de33a Abhinav Kumar 2022-04-26 277 return -EINVAL;
d7d0e73f7de33a Abhinav Kumar 2022-04-26 278 } else if (fb->height != mode->vdisplay) {
d7d0e73f7de33a Abhinav Kumar 2022-04-26 279 DPU_ERROR("invalid fb h=%d, mode h=%d\n", fb->height,
d7d0e73f7de33a Abhinav Kumar 2022-04-26 280 mode->vdisplay);
d7d0e73f7de33a Abhinav Kumar 2022-04-26 281 return -EINVAL;
d7d0e73f7de33a Abhinav Kumar 2022-04-26 282 } else if (fb->width > DEFAULT_MAX_WRITEBACK_WIDTH) {
d7d0e73f7de33a Abhinav Kumar 2022-04-26 283 DPU_ERROR("invalid fb w=%d, maxlinewidth=%u\n",
d7d0e73f7de33a Abhinav Kumar 2022-04-26 284 fb->width, DEFAULT_MAX_WRITEBACK_WIDTH);
d7d0e73f7de33a Abhinav Kumar 2022-04-26 285 return -EINVAL;
d7d0e73f7de33a Abhinav Kumar 2022-04-26 286 }
d7d0e73f7de33a Abhinav Kumar 2022-04-26 287
d7d0e73f7de33a Abhinav Kumar 2022-04-26 288 return 0;
d7d0e73f7de33a Abhinav Kumar 2022-04-26 289 }

--
0-DAY CI Kernel Test Service
https://01.org/lkp

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