From: John Fastabend john.fastabend@gmail.com
[ Upstream commit 44580a0118d3ede95fec4dce32df5f75f73cd663 ]
sock_map and ULP only work together when ULP is loaded after the sock map is loaded. In the sock_map case we added a check for this to fail the load if ULP is already set. However, we missed the check on the sock_hash side.
Add a ULP check to the sock_hash update path.
Fixes: 604326b41a6fb ("bpf, sockmap: convert to generic sk_msg interface") Reported-by: syzbot+7a6ee4d0078eac6bf782@syzkaller.appspotmail.com Signed-off-by: John Fastabend john.fastabend@gmail.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- net/core/sock_map.c | 3 +++ 1 file changed, 3 insertions(+)
--- a/net/core/sock_map.c +++ b/net/core/sock_map.c @@ -661,6 +661,7 @@ static int sock_hash_update_common(struc struct sock *sk, u64 flags) { struct bpf_htab *htab = container_of(map, struct bpf_htab, map); + struct inet_connection_sock *icsk = inet_csk(sk); u32 key_size = map->key_size, hash; struct bpf_htab_elem *elem, *elem_new; struct bpf_htab_bucket *bucket; @@ -671,6 +672,8 @@ static int sock_hash_update_common(struc WARN_ON_ONCE(!rcu_read_lock_held()); if (unlikely(flags > BPF_EXIST)) return -EINVAL; + if (unlikely(icsk->icsk_ulp_data)) + return -EINVAL;
link = sk_psock_init_link(); if (!link)