4.10-stable review patch. If anyone has any objections, please let me know.
------------------
From: Martin Schwidefsky <schwidefsky@xxxxxxxxxx>
commit 8676caa4fb7fc02b2c76842a0024919d0caa4b8d upstream.
The data stored by the STSI instruction can be up to a page in size
but the memblock_virt_alloc allocation for tl_info only specifies
16 bytes. The memory after the short allocation is overwritten
every time arch_update_cpu_topology is called.
Fixes: 8c9105802235 "s390/numa: establish cpu to node mapping early"
Signed-off-by: Martin Schwidefsky <schwidefsky@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/s390/kernel/topology.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/arch/s390/kernel/topology.c
+++ b/arch/s390/kernel/topology.c
@@ -466,7 +466,7 @@ void __init topology_init_early(void)
set_sched_topology(s390_topology);
if (!MACHINE_HAS_TOPOLOGY)
goto out;
- tl_info = memblock_virt_alloc(sizeof(*tl_info), PAGE_SIZE);
+ tl_info = memblock_virt_alloc(PAGE_SIZE, PAGE_SIZE);
info = tl_info;
store_topology(info);
pr_info("The CPU configuration topology of the machine is:");