diff options
Diffstat (limited to 'net')
| -rw-r--r-- | net/ipv4/tcp.c | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c index eb2d80519f8e..a697f1455f8d 100644 --- a/net/ipv4/tcp.c +++ b/net/ipv4/tcp.c @@ -3667,13 +3667,26 @@ static int do_tcp_getsockopt(struct sock *sk, int level, if (get_user(len, optlen)) return -EFAULT; - if (len != sizeof(zc)) + if (len < offsetofend(struct tcp_zerocopy_receive, length)) return -EINVAL; + if (len > sizeof(zc)) + len = sizeof(zc); if (copy_from_user(&zc, optval, len)) return -EFAULT; lock_sock(sk); err = tcp_zerocopy_receive(sk, &zc); release_sock(sk); + switch (len) { + case sizeof(zc): + case offsetofend(struct tcp_zerocopy_receive, inq): + goto zerocopy_rcv_inq; + case offsetofend(struct tcp_zerocopy_receive, length): + default: + goto zerocopy_rcv_out; + } +zerocopy_rcv_inq: + zc.inq = tcp_inq_hint(sk); +zerocopy_rcv_out: if (!err && copy_to_user(optval, &zc, len)) err = -EFAULT; return err; |