sched/topology: Fix sched_domain_topology_level alloc in sched_init_numa()

mainline inclusion
from mainline-v5.12-rc1
commit 71e5f664
category: bugfix
bugzilla: 182847,https://gitee.com/openeuler/kernel/issues/I4EVBL
CVE: NA

----------------------------------------------------------

Commit "sched/topology: Make sched_init_numa() use a set for the
deduplicating sort" allocates 'i + nr_levels (level)' instead of
'i + nr_levels + 1' sched_domain_topology_level.

This led to an Oops (on Arm64 juno with CONFIG_SCHED_DEBUG):

sched_init_domains
  build_sched_domains()
    __free_domain_allocs()
      __sdt_free() {
	...
        for_each_sd_topology(tl)
	  ...
          sd = *per_cpu_ptr(sdd->sd, j); <--
	  ...
      }
Signed-off-by: NDietmar Eggemann <dietmar.eggemann@arm.com>
Signed-off-by: NPeter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: NIngo Molnar <mingo@kernel.org>
Tested-by: NVincent Guittot <vincent.guittot@linaro.org>
Tested-by: NBarry Song <song.bao.hua@hisilicon.com>
Link: https://lkml.kernel.org/r/6000e39e-7d28-c360-9cd6-8798fd22a9bf@arm.com
Fixes: 620a6dc4 ("sched/topology: Make sched_init_numa() use a set for the deduplicating sort")
Signed-off-by: NJialin Zhang <zhangjialin11@huawei.com>
Reviewed-by: NCheng Jian <cj.chengjian@huawei.com>
Signed-off-by: NCheng Jian <cj.chengjian@huawei.com>

kernel/sched/topology.c

@@ -1548,7 +1548,7 @@ void sched_init_numa(void)
 	/* Compute default topology size */
 	for (i = 0; sched_domain_topology[i].mask; i++);
 
-	tl = kzalloc((i + nr_levels) *
+	tl = kzalloc((i + nr_levels + 1) *
 			sizeof(struct sched_domain_topology_level), GFP_KERNEL);
 	if (!tl)
 		return;