On Mon, Feb 28, 2022 at 09:58:43AM +0100, gregkh@linuxfoundation.org wrote:

The patch below does not apply to the 5.15-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.

This version applies to 5.15 and should apply to older version as well.

From d4895990ebea634715d2dcf54121c5ae5a6612bc Mon Sep 17 00:00:00 2001 From: Miaohe Lin linmiaohe@huawei.com Date: Thu, 17 Feb 2022 22:53:27 +0800 Subject: [PATCH] memblock: use kfree() to release kmalloced memblock regions

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 --- mm/memblock.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/mm/memblock.c b/mm/memblock.c index 5096500b2647..2b7397781c99 100644 --- 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;