arm_pmu: acpi: handle allocation failure

One of the failure paths in the arm_pmu ACPI code is missing an early
return, permitting a NULL pointer dereference upon a memory allocation
failure.

Add the missing return.

Fixes: fe40ffdb7656 ("arm_pmu: rework ACPI probing")
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Reported-by: Will Deacon <will@kernel.org>
Link: https://lore.kernel.org/r/20221108093725.1239563-1-mark.rutland@arm.com
Signed-off-by: Will Deacon <will@kernel.org>

diff --git a/drivers/perf/arm_pmu_acpi.c b/drivers/perf/arm_pmu_acpi.c
index a085e45..90815ad 100644 (file)
--- a/drivers/perf/arm_pmu_acpi.c
+++ b/drivers/perf/arm_pmu_acpi.c
@@ -333,6 +333,7 @@ int arm_pmu_acpi_probe(armpmu_init_fn init_fn)
                if (!pmu) {
                        pr_warn("Unable to allocate PMU for CPU%d\n",
                                cpu);
+                       return -ENOMEM;
                }
 
                cpuid = per_cpu(cpu_data, cpu).reg_midr;