Hello Christian Gmeiner,
The patch 9e2c2e273012: "drm/etnaviv: add infrastructure to query
perf counter" from Sep 24, 2017, leads to the following static
checker warning:
drivers/gpu/drm/etnaviv/etnaviv_drv.c:449 etnaviv_ioctl_pm_query_dom()
warn: 'args->pipe' is out of bounds '3' vs '2'
drivers/gpu/drm/etnaviv/etnaviv_drv.c
435 static int etnaviv_ioctl_pm_query_dom(struct drm_device *dev, void *data,
436 struct drm_file *file)
437 {
438 struct etnaviv_drm_private *priv = dev->dev_private;
439 struct drm_etnaviv_pm_domain *args = data;
440 struct etnaviv_gpu *gpu;
441
442 if (args->pipe >= ETNA_MAX_PIPES)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
arg->pipe goes up to 3.
443 return -EINVAL;
444
445 gpu = priv->gpu[args->pipe];
446 if (!gpu)
447 return -ENXIO;
448
449 return etnaviv_pm_query_dom(gpu, args);
^^^^
That is invalid here.
450 }
drivers/gpu/drm/etnaviv/etnaviv_perfmon.c
411 static const struct etnaviv_pm_domain_meta doms_meta[] = {
^^^^^^^^^
This array has 3 elements.
412 {
413 .nr_domains = ARRAY_SIZE(doms_3d),
414 .domains = &doms_3d[0]
415 },
416 {
417 .nr_domains = ARRAY_SIZE(doms_2d),
418 .domains = &doms_2d[0]
419 },
420 {
421 .nr_domains = ARRAY_SIZE(doms_vg),
422 .domains = &doms_vg[0]
423 }
424 };
425
426 int etnaviv_pm_query_dom(struct etnaviv_gpu *gpu,
427 struct drm_etnaviv_pm_domain *domain)
428 {
429 const struct etnaviv_pm_domain_meta *meta = &doms_meta[domain->pipe];
^^^^^^^^^^^^^^^^^^^^^^^
If domain->pipe is 3 then we are one element beyond the end of the
array.
430 const struct etnaviv_pm_domain *dom;
431
432 if (domain->iter >= meta->nr_domains)
433 return -EINVAL;
434
435 dom = meta->domains + domain->iter;
436
437 domain->id = domain->iter;
438 domain->nr_signals = dom->nr_signals;
439 strncpy(domain->name, dom->name, sizeof(domain->name));
440
441 domain->iter++;
442 if (domain->iter == meta->nr_domains)
443 domain->iter = 0xff;
444
445 return 0;
446 }
regards,
dan carpenter
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