1 files changed, 16 insertions, 12 deletions

diff --git a/kernel/bpf/arraymap.c b/kernel/bpf/arraymap.c
index b1f66480135b..a364c408f25a 100644
--- a/kernel/bpf/arraymap.c
+++ b/kernel/bpf/arraymap.c
@@ -73,11 +73,11 @@ static int array_map_alloc_check(union bpf_attr *attr)
 static struct bpf_map *array_map_alloc(union bpf_attr *attr)
 {
         bool percpu = attr->map_type == BPF_MAP_TYPE_PERCPU_ARRAY;
-        int numa_node = bpf_map_attr_numa_node(attr);
+        int ret, numa_node = bpf_map_attr_numa_node(attr);
         u32 elem_size, index_mask, max_entries;
         bool unpriv = !capable(CAP_SYS_ADMIN);
+        u64 cost, array_size, mask64;
         struct bpf_array *array;
-        u64 array_size, mask64;
 
         elem_size = round_up(attr->value_size, 8);
 
@@ -109,8 +109,19 @@ static struct bpf_map *array_map_alloc(union bpf_attr *attr)
                 array_size += (u64) max_entries * elem_size;
 
         /* make sure there is no u32 overflow later in round_up() */
-        if (array_size >= U32_MAX - PAGE_SIZE)
+        cost = array_size;
+        if (cost >= U32_MAX - PAGE_SIZE)
                 return ERR_PTR(-ENOMEM);
+        if (percpu) {
+                cost += (u64)attr->max_entries * elem_size * num_possible_cpus();
+                if (cost >= U32_MAX - PAGE_SIZE)
+                        return ERR_PTR(-ENOMEM);
+        }
+        cost = round_up(cost, PAGE_SIZE) >> PAGE_SHIFT;
+
+        ret = bpf_map_precharge_memlock(cost);
+        if (ret < 0)
+                return ERR_PTR(ret);
 
         /* allocate all map elements and zero-initialize them */
         array = bpf_map_area_alloc(array_size, numa_node);
@@ -121,20 +132,13 @@ static struct bpf_map *array_map_alloc(union bpf_attr *attr)
 
         /* copy mandatory map attributes */
         bpf_map_init_from_attr(&array->map, attr);
+        array->map.pages = cost;
         array->elem_size = elem_size;
 
-        if (!percpu)
-                goto out;
-
-        array_size += (u64) attr->max_entries * elem_size * num_possible_cpus();
-
-        if (array_size >= U32_MAX - PAGE_SIZE ||
-            bpf_array_alloc_percpu(array)) {
+        if (percpu && bpf_array_alloc_percpu(array)) {
                 bpf_map_area_free(array);
                 return ERR_PTR(-ENOMEM);
         }
-out:
-        array->map.pages = round_up(array_size, PAGE_SIZE) >> PAGE_SHIFT;
 
         return &array->map;
 }