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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>
This commit is contained in:
Soheil Hassas Yeganeh 2018-02-27 18:22:40 -05:00 committed by David S. Miller
parent 96dbdc5d8c
commit 7797dc4141
1 changed files with 6 additions and 4 deletions
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10
net/socket.c
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@ -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;