diff options
| author | Soheil Hassas Yeganeh <soheil@google.com> | 2018-02-27 18:22:40 -0500 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-03-01 21:27:49 -0500 |
| commit | 7797dc41417eb0e03f39fc4356f7635bcdef108e (patch) | |
| tree | 9ef5eb3e95c7ff55e975515a624ec7dd16a5c672 | |
| parent | 96dbdc5d8c48d438bb372fc3662c9a34fb44b498 (diff) | |
socket: skip checking sk_err for recvmmsg(MSG_ERRQUEUE)
recvmmsg does not call ___sys_recvmsg when sk_err is set.
That is fine for normal reads but, for MSG_ERRQUEUE, recvmmsg
should always call ___sys_recvmsg regardless of sk->sk_err to
be able to clear error queue. Otherwise, users are not able to
drain the error queue using recvmmsg.
Signed-off-by: Soheil Hassas Yeganeh <soheil@google.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | net/socket.c | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/net/socket.c b/net/socket.c index 645d32b4872c..d9a1ac233b35 100644 --- a/net/socket.c +++ b/net/socket.c @@ -2289,10 +2289,12 @@ int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen, if (!sock) return err; - err = sock_error(sock->sk); - if (err) { - datagrams = err; - goto out_put; + if (likely(!(flags & MSG_ERRQUEUE))) { + err = sock_error(sock->sk); + if (err) { + datagrams = err; + goto out_put; + } } entry = mmsg; |