[006/146] net: recvmmsg: Strip MSG_WAITFORONE when calling recvmsg

Greg KH
2011-06-01T08:06:50Z

From: Anton Blanchard <anton@samba.org>

commit b9eb8b8752804cecbacdb4d24b52e823cf07f107 upstream.

recvmmsg fails on a raw socket with EINVAL. The reason for this is
packet_recvmsg checks the incoming flags:

err = -EINVAL;
if (flags & ~(MSG_PEEK|MSG_DONTWAIT|MSG_TRUNC|MSG_CMSG_COMPAT|MSG_ERRQUEUE))
goto out;

This patch strips out MSG_WAITFORONE when calling recvmmsg which
fixes the issue.

Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

---
net/socket.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)

--- a/net/socket.c
+++ b/net/socket.c
@@ -2117,14 +2117,16 @@ int __sys_recvmmsg(int fd, struct mmsghd
*/
if (MSG_CMSG_COMPAT & flags) {
err = __sys_recvmsg(sock, (struct msghdr __user *)compat_entry,
- &msg_sys, flags, datagrams);
+ &msg_sys, flags & ~MSG_WAITFORONE,
+ datagrams);
if (err < 0)
break;
err = __put_user(err, &compat_entry->msg_len);
++compat_entry;
} else {
err = __sys_recvmsg(sock, (struct msghdr __user *)entry,
- &msg_sys, flags, datagrams);
+ &msg_sys, flags & ~MSG_WAITFORONE,
+ datagrams);
if (err < 0)
break;
err = put_user(err, &entry->msg_len);