6.12-stable review patch. If anyone has any objections, please let me know.
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From: Peter Zijlstra peterz@infradead.org
[ Upstream commit da02f54e81db2f7bf6af9d1d0cfc5b41ec6d0dcb ]
Make sure that perf_try_init_event() doesn't leave event->pmu nor event->destroy set on failure.
Signed-off-by: Peter Zijlstra (Intel) peterz@infradead.org Signed-off-by: Ingo Molnar mingo@kernel.org Acked-by: Ravi Bangoria ravi.bangoria@amd.com Link: https://lore.kernel.org/r/20250205102449.110145835@infradead.org Signed-off-by: Sasha Levin sashal@kernel.org --- kernel/events/core.c | 65 ++++++++++++++++++++++++++------------------ 1 file changed, 38 insertions(+), 27 deletions(-)
diff --git a/kernel/events/core.c b/kernel/events/core.c index edafe9fc4bdd0..19dde12f23b83 100644 --- a/kernel/events/core.c +++ b/kernel/events/core.c @@ -11978,40 +11978,51 @@ static int perf_try_init_event(struct pmu *pmu, struct perf_event *event) if (ctx) perf_event_ctx_unlock(event->group_leader, ctx);
- if (!ret) { - if (!(pmu->capabilities & PERF_PMU_CAP_EXTENDED_REGS) && - has_extended_regs(event)) - ret = -EOPNOTSUPP; + if (ret) + goto err_pmu;
- if (pmu->capabilities & PERF_PMU_CAP_NO_EXCLUDE && - event_has_any_exclude_flag(event)) - ret = -EINVAL; + if (!(pmu->capabilities & PERF_PMU_CAP_EXTENDED_REGS) && + has_extended_regs(event)) { + ret = -EOPNOTSUPP; + goto err_destroy; + }
- if (pmu->scope != PERF_PMU_SCOPE_NONE && event->cpu >= 0) { - const struct cpumask *cpumask = perf_scope_cpu_topology_cpumask(pmu->scope, event->cpu); - struct cpumask *pmu_cpumask = perf_scope_cpumask(pmu->scope); - int cpu; - - if (pmu_cpumask && cpumask) { - cpu = cpumask_any_and(pmu_cpumask, cpumask); - if (cpu >= nr_cpu_ids) - ret = -ENODEV; - else - event->event_caps |= PERF_EV_CAP_READ_SCOPE; - } else { - ret = -ENODEV; - } - } + if (pmu->capabilities & PERF_PMU_CAP_NO_EXCLUDE && + event_has_any_exclude_flag(event)) { + ret = -EINVAL; + goto err_destroy; + }
- if (ret && event->destroy) - event->destroy(event); + if (pmu->scope != PERF_PMU_SCOPE_NONE && event->cpu >= 0) { + const struct cpumask *cpumask; + struct cpumask *pmu_cpumask; + int cpu; + + cpumask = perf_scope_cpu_topology_cpumask(pmu->scope, event->cpu); + pmu_cpumask = perf_scope_cpumask(pmu->scope); + + ret = -ENODEV; + if (!pmu_cpumask || !cpumask) + goto err_destroy; + + cpu = cpumask_any_and(pmu_cpumask, cpumask); + if (cpu >= nr_cpu_ids) + goto err_destroy; + + event->event_caps |= PERF_EV_CAP_READ_SCOPE; }
- if (ret) { - event->pmu = NULL; - module_put(pmu->module); + return 0; + +err_destroy: + if (event->destroy) { + event->destroy(event); + event->destroy = NULL; }
+err_pmu: + event->pmu = NULL; + module_put(pmu->module); return ret; }