From: Miaohe Lin <linmiaohe@xxxxxxxxxx> 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@xxxxxxxxxx> Fixes: 3010f876500f ("mm: discard memblock data later") Signed-off-by: Mike Rapoport <rppt@xxxxxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- mm/memblock.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) --- a/mm/memblock.c +++ b/mm/memblock.c @@ -366,14 +366,20 @@ 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); } memblock_memory = NULL; Patches currently in stable-queue which might be from linmiaohe@xxxxxxxxxx are queue-5.16/memblock-use-kfree-to-release-kmalloced-memblock-regions.patch