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-rw-r--r--kernel/bpf/arraymap.c4
-rw-r--r--kernel/bpf/syscall.c19
2 files changed, 20 insertions, 3 deletions
diff --git a/kernel/bpf/arraymap.c b/kernel/bpf/arraymap.c
index 614bcd4..cb31229 100644
--- a/kernel/bpf/arraymap.c
+++ b/kernel/bpf/arraymap.c
@@ -202,7 +202,7 @@ static int prog_array_map_update_elem(struct bpf_map *map, void *key,
old_prog = xchg(array->prog + index, prog);
if (old_prog)
- bpf_prog_put(old_prog);
+ bpf_prog_put_rcu(old_prog);
return 0;
}
@@ -218,7 +218,7 @@ static int prog_array_map_delete_elem(struct bpf_map *map, void *key)
old_prog = xchg(array->prog + index, NULL);
if (old_prog) {
- bpf_prog_put(old_prog);
+ bpf_prog_put_rcu(old_prog);
return 0;
} else {
return -ENOENT;
diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index 98a69bd..a1b14d1 100644
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c
@@ -432,6 +432,23 @@ static void free_used_maps(struct bpf_prog_aux *aux)
kfree(aux->used_maps);
}
+static void __prog_put_rcu(struct rcu_head *rcu)
+{
+ struct bpf_prog_aux *aux = container_of(rcu, struct bpf_prog_aux, rcu);
+
+ free_used_maps(aux);
+ bpf_prog_free(aux->prog);
+}
+
+/* version of bpf_prog_put() that is called after a grace period */
+void bpf_prog_put_rcu(struct bpf_prog *prog)
+{
+ if (atomic_dec_and_test(&prog->aux->refcnt)) {
+ prog->aux->prog = prog;
+ call_rcu(&prog->aux->rcu, __prog_put_rcu);
+ }
+}
+
void bpf_prog_put(struct bpf_prog *prog)
{
if (atomic_dec_and_test(&prog->aux->refcnt)) {
@@ -445,7 +462,7 @@ static int bpf_prog_release(struct inode *inode, struct file *filp)
{
struct bpf_prog *prog = filp->private_data;
- bpf_prog_put(prog);
+ bpf_prog_put_rcu(prog);
return 0;
}
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