[PATCH 4.14 30/31] memblock: use kfree() to release kmalloced memblock regions

Greg Kroah-Hartman
2022-02-28T17:29:40Z

From: Miaohe Lin <linmiaohe@huawei.com>

commit c94afc46cae7ad41b2ad6a99368147879f4b0e56 upstream.

memblock.{reserved,memory}.regions may be allocated using kmalloc() in
memblock_double_array(). Use kfree() to release these kmalloced regions
indicated by memblock_{reserved,memory}_in_slab.

Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Fixes: 3010f876500f ("mm: discard memblock data later")
Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
mm/memblock.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)

--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -260,14 +260,20 @@ void __init memblock_discard(void)
addr = __pa(memblock.reserved.regions);
size = PAGE_ALIGN(sizeof(struct memblock_region) *
memblock.reserved.max);
- __memblock_free_late(addr, size);
+ if (memblock_reserved_in_slab)
+ kfree(memblock.reserved.regions);
+ else
+ __memblock_free_late(addr, size);
}

if (memblock.memory.regions != memblock_memory_init_regions) {
addr = __pa(memblock.memory.regions);
size = PAGE_ALIGN(sizeof(struct memblock_region) *
memblock.memory.max);
- __memblock_free_late(addr, size);
+ if (memblock_memory_in_slab)
+ kfree(memblock.memory.regions);
+ else
+ __memblock_free_late(addr, size);
}
}
#endif