[tip: sched/core] sched/topology: Fix sched_domain_topology_level alloc in sched_init_numa()

[tip-bot2 for Dietmar Eggemann]

The following commit has been merged into the sched/core branch of tip:

Commit-ID:     e972d92d52a1f691498add14feb2ee5902d02404
Gitweb:        https://git.kernel.org/tip/e972d92d52a1f691498add14feb2ee5902d02404
Author:        Dietmar Eggemann <dietmar.eggemann@xxxxxxx>
AuthorDate:    Mon, 01 Feb 2021 10:53:53 +01:00
Committer:     Peter Zijlstra <peterz@xxxxxxxxxxxxx>
CommitterDate: Mon, 01 Feb 2021 15:31:39 +01:00

sched/topology: Fix sched_domain_topology_level alloc in sched_init_numa()

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: Dietmar Eggemann <dietmar.eggemann@xxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Tested-by: Vincent Guittot <vincent.guittot@xxxxxxxxxx>
Tested-by: Barry Song <song.bao.hua@xxxxxxxxxxxxx>
Link: https://lkml.kernel.org/r/6000e39e-7d28-c360-9cd6-8798fd22a9bf@xxxxxxx
---
 kernel/sched/topology.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/sched/topology.c b/kernel/sched/topology.c
index bf5c9bd..09d3504 100644
--- a/kernel/sched/topology.c
+++ b/kernel/sched/topology.c
@@ -1702,7 +1702,7 @@ 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;