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perf/x86/intel: Fix memory leak on hot-plug allocation fail
We fail to free the shared_regs allocation if the constraint_list allocation fails. Cure this and be more consistent in NULL-ing the pointers after free. Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Cc: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@kernel.org>
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@ -2534,7 +2534,7 @@ static int intel_pmu_cpu_prepare(int cpu)
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if (x86_pmu.extra_regs || x86_pmu.lbr_sel_map) {
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cpuc->shared_regs = allocate_shared_regs(cpu);
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if (!cpuc->shared_regs)
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return NOTIFY_BAD;
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goto err;
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}
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if (x86_pmu.flags & PMU_FL_EXCL_CNTRS) {
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@ -2542,18 +2542,27 @@ static int intel_pmu_cpu_prepare(int cpu)
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cpuc->constraint_list = kzalloc(sz, GFP_KERNEL);
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if (!cpuc->constraint_list)
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return NOTIFY_BAD;
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goto err_shared_regs;
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cpuc->excl_cntrs = allocate_excl_cntrs(cpu);
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if (!cpuc->excl_cntrs) {
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kfree(cpuc->constraint_list);
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kfree(cpuc->shared_regs);
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return NOTIFY_BAD;
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}
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if (!cpuc->excl_cntrs)
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goto err_constraint_list;
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cpuc->excl_thread_id = 0;
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}
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return NOTIFY_OK;
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err_constraint_list:
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kfree(cpuc->constraint_list);
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cpuc->constraint_list = NULL;
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err_shared_regs:
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kfree(cpuc->shared_regs);
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cpuc->shared_regs = NULL;
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err:
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return NOTIFY_BAD;
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}
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static void intel_pmu_cpu_starting(int cpu)
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