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bpf: Use struct_size() helper

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In an effort to avoid open-coded arithmetic in the kernel, use the
struct_size() helper instead of open-coded calculation.

Signed-off-by: Xiu Jianfeng <xiujianfeng@huawei.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://github.com/KSPP/linux/issues/160
Link: https://lore.kernel.org/bpf/20211220113048.2859-1-xiujianfeng@huawei.com
This commit is contained in:
Xiu Jianfeng 2021-12-20 19:30:48 +08:00 committed by Andrii Nakryiko
parent 426b87b111
commit 0dd668d208
2 changed files with 2 additions and 7 deletions
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3
kernel/bpf/local_storage.c
View File

@ -163,8 +163,7 @@ static int cgroup_storage_update_elem(struct bpf_map *map, void *key,
return 0;
}
new = bpf_map_kmalloc_node(map, sizeof(struct bpf_storage_buffer) +
map->value_size,
new = bpf_map_kmalloc_node(map, struct_size(new, data, map->value_size),
__GFP_ZERO | GFP_ATOMIC | __GFP_NOWARN,
map->numa_node);
if (!new)

6
kernel/bpf/reuseport_array.c
View File

@ -152,16 +152,12 @@ static struct bpf_map *reuseport_array_alloc(union bpf_attr *attr)
{
int numa_node = bpf_map_attr_numa_node(attr);
struct reuseport_array *array;
u64 array_size;
if (!bpf_capable())
return ERR_PTR(-EPERM);
array_size = sizeof(*array);
array_size += (u64)attr->max_entries * sizeof(struct sock *);
/* allocate all map elements and zero-initialize them */
array = bpf_map_area_alloc(array_size, numa_node);
array = bpf_map_area_alloc(struct_size(array, ptrs, attr->max_entries), numa_node);
if (!array)
return ERR_PTR(-ENOMEM);