perf/smmuv3: Validate group size (33e84ea4) · Commits · 戴 / test

drivers/perf/arm_smmuv3_pmu.c

+14 −8

Original line number	Diff line number	Diff line
		@@ -323,6 +323,7 @@ static int smmu_pmu_event_init(struct perf_event *event)
		struct smmu_pmu *smmu_pmu = to_smmu_pmu(event->pmu);
		struct device *dev = smmu_pmu->dev;
		struct perf_event *sibling;
		int group_num_events = 1;
		u16 event_id;

		if (event->attr.type != event->pmu->type)
		@@ -347,18 +348,23 @@ static int smmu_pmu_event_init(struct perf_event *event)
		}

		/* Don't allow groups with mixed PMUs, except for s/w events */
		if (event->group_leader->pmu != event->pmu &&
		!is_software_event(event->group_leader)) {
		dev_dbg(dev, "Can't create mixed PMU group\n");
		if (!is_software_event(event->group_leader)) {
		if (event->group_leader->pmu != event->pmu)
		return -EINVAL;

		if (++group_num_events > smmu_pmu->num_counters)
		return -EINVAL;
		}

		for_each_sibling_event(sibling, event->group_leader) {
		if (sibling->pmu != event->pmu &&
		!is_software_event(sibling)) {
		dev_dbg(dev, "Can't create mixed PMU group\n");
		if (is_software_event(sibling))
		continue;

		if (sibling->pmu != event->pmu)
		return -EINVAL;

		if (++group_num_events > smmu_pmu->num_counters)
		return -EINVAL;
		}
		}

		hwc->idx = -1;