Hello Daniel Stone,
This is a semi-automatic email about new static checker warnings.
The patch de7b6be7f300: "drm: Use atomic state for FB in legacy
ioctls" from Dec 13, 2016, leads to the following Smatch complaint:
drivers/gpu/drm/drm_crtc.c:392 drm_mode_getcrtc()
error: we previously assumed 'crtc->primary->state' could be null (see
line 384)
drivers/gpu/drm/drm_crtc.c
383
384 if (crtc->primary->state && crtc->primary->state->fb)
^^^^^^^^^^^^^^^^^^^^
New check for NULL.
385 crtc_resp->fb_id = crtc->primary->state->fb->base.id;
386 else if (!crtc->primary->state && crtc->primary->fb)
387 crtc_resp->fb_id = crtc->primary->fb->base.id;
388 else
389 crtc_resp->fb_id = 0;
390
391 if (crtc->state) {
392 crtc_resp->x = crtc->primary->state->src_x >> 16;
^^^^^^^^^^^^^^^^^^^^^^^^^^^
Old unchecked dereference. It's possible that non-NULL "crtc->state"
implies a non-NULL "crtc->primary->state", but I didn't spot the
relationship immediately.
393 crtc_resp->y = crtc->primary->state->src_y >> 16;
394 if (crtc->state->enable) {
regards,
dan carpenter
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