Perform all validations when updating values of struct_ops maps. Doing
validation in st_ops->reg() and st_ops->update() is not necessary anymore.
However, tcp_register_congestion_control() has been called in various
places. It still needs to do validations.
Cc: netdev@xxxxxxxxxxxxxxx
Signed-off-by: Kui-Feng Lee <thinker.li@xxxxxxxxx>
---
kernel/bpf/bpf_struct_ops.c | 11 ++++++-----
net/ipv4/tcp_cong.c | 6 +-----
2 files changed, 7 insertions(+), 10 deletions(-)
diff --git a/kernel/bpf/bpf_struct_ops.c b/kernel/bpf/bpf_struct_ops.c
index a6019087b467..07e554c191d1 100644
--- a/kernel/bpf/bpf_struct_ops.c
+++ b/kernel/bpf/bpf_struct_ops.c
@@ -672,13 +672,14 @@ static long bpf_struct_ops_map_update_elem(struct bpf_map *map, void *key,
*(unsigned long *)(udata + moff) = prog->aux->id;
}
+ if (st_ops->validate) {
+ err = st_ops->validate(kdata);
+ if (err)
+ goto reset_unlock;
+ }
+
if (st_map->map.map_flags & BPF_F_LINK) {
err = 0;
- if (st_ops->validate) {
- err = st_ops->validate(kdata);
- if (err)
- goto reset_unlock;
- }
arch_protect_bpf_trampoline(st_map->image, PAGE_SIZE);
/* Let bpf_link handle registration & unregistration.
*
diff --git a/net/ipv4/tcp_cong.c b/net/ipv4/tcp_cong.c
index 1b34050a7538..28ffcfbeef14 100644
--- a/net/ipv4/tcp_cong.c
+++ b/net/ipv4/tcp_cong.c
@@ -146,11 +146,7 @@ EXPORT_SYMBOL_GPL(tcp_unregister_congestion_control);
int tcp_update_congestion_control(struct tcp_congestion_ops *ca, struct tcp_congestion_ops *old_ca)
{
struct tcp_congestion_ops *existing;
- int ret;
-
- ret = tcp_validate_congestion_control(ca);
- if (ret)
- return ret;
+ int ret = 0;
ca->key = jhash(ca->name, sizeof(ca->name), strlen(ca->name));
--
2.34.1
