From: Yicong Yang yangyicong@hisilicon.com
maillist inclusion category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I8BOML CVE: NA
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/will/linux.git/commit/?h=for...
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Check whether the event type matches the PMU type firstly in pmu::event_init() before touching the event. Otherwise we'll change the events of others and lead to incorrect results. Since in perf_init_event() we may call every pmu's event_init() in a certain case, we should not modify the event if it's not ours.
Fixes: 8404b0fbc7fb ("drivers/perf: hisi: Add driver for HiSilicon PCIe PMU") Signed-off-by: Yicong Yang yangyicong@hisilicon.com Link: https://lore.kernel.org/r/20231024092954.42297-2-yangyicong@huawei.com Signed-off-by: Will Deacon will@kernel.org Signed-off-by: Junhao He hejunhao3@huawei.com --- drivers/perf/hisilicon/hisi_pcie_pmu.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/drivers/perf/hisilicon/hisi_pcie_pmu.c b/drivers/perf/hisilicon/hisi_pcie_pmu.c index 8f59387aeab0..530c8d8b9ac4 100644 --- a/drivers/perf/hisilicon/hisi_pcie_pmu.c +++ b/drivers/perf/hisilicon/hisi_pcie_pmu.c @@ -359,6 +359,10 @@ static int hisi_pcie_pmu_event_init(struct perf_event *event) struct hisi_pcie_pmu *pcie_pmu = to_pcie_pmu(event->pmu); struct hw_perf_event *hwc = &event->hw;
+ /* Check the type first before going on, otherwise it's not our event */ + if (event->attr.type != event->pmu->type) + return -ENOENT; + event->cpu = pcie_pmu->on_cpu;
if (EXT_COUNTER_IS_USED(hisi_pcie_get_event(event))) @@ -366,9 +370,6 @@ static int hisi_pcie_pmu_event_init(struct perf_event *event) else hwc->event_base = HISI_PCIE_CNT;
- if (event->attr.type != event->pmu->type) - return -ENOENT; - /* Sampling is not supported. */ if (is_sampling_event(event) || event->attach_state & PERF_ATTACH_TASK) return -EOPNOTSUPP;