diff options
| -rw-r--r-- | net/ipv4/tcp.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index 058f509ca98e..4c88d20d91d4 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -3062,6 +3062,11 @@ static int do_tcp_getsockopt(struct sock *sk, int level, if (get_user(len, optlen)) return -EFAULT; len = min_t(unsigned int, len, TCP_ULP_NAME_MAX); + if (!icsk->icsk_ulp_ops) { + if (put_user(0, optlen)) + return -EFAULT; + return 0; + } if (put_user(len, optlen)) return -EFAULT; if (copy_to_user(optval, icsk->icsk_ulp_ops->name, len)) |