Commit dca7acd8 authored by Hou Tao's avatar Hou Tao Committed by Alexei Starovoitov
Browse files

bpf: Skip unit_size checking for global per-cpu allocator 



For global per-cpu allocator, the size of free object in free list
doesn't match with unit_size and now there is no way to get the size of
per-cpu pointer saved in free object, so just skip the checking.

Reported-by: default avatarStephen Rothwell <sfr@canb.auug.org.au>
Closes: https://lore.kernel.org/bpf/20230913133436.0eeec4cb@canb.auug.org.au/


Signed-off-by: default avatarHou Tao <houtao1@huawei.com>
Tested-by: default avatarBiju Das <biju.das.jz@bp.renesas.com>
Link: https://lore.kernel.org/r/20230913135943.3137292-1-houtao@huaweicloud.com


Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
parent 837723b2

kernel/bpf/memalloc.c

+7 −0
Original line number Diff line number Diff line
@@ -491,6 +491,13 @@ static int check_obj_size(struct bpf_mem_cache *c, unsigned int idx) 
	struct llist_node *first;

	unsigned int obj_size;



	/* For per-cpu allocator, the size of free objects in free list doesn't

	 * match with unit_size and now there is no way to get the size of

	 * per-cpu pointer saved in free object, so just skip the checking.

	 */

	if (c->percpu_size)

		return 0;



	first = c->free_llist.first;

	if (!first)

		return 0;