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bpf: Skip unit_size checking for global per-cpu allocator

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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: Stephen Rothwell <sfr@canb.auug.org.au>
Closes: https://lore.kernel.org/bpf/20230913133436.0eeec4cb@canb.auug.org.au/
Signed-off-by: Hou Tao <houtao1@huawei.com>
Tested-by: Biju Das <biju.das.jz@bp.renesas.com>
Link: https://lore.kernel.org/r/20230913135943.3137292-1-houtao@huaweicloud.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Hou Tao 2023-09-13 21:59:43 +08:00 committed by Alexei Starovoitov
parent 837723b22a
commit dca7acd84e
1 changed files with 7 additions and 0 deletions
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7
kernel/bpf/memalloc.c
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@ -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;