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net: recvmmsg: Strip MSG_WAITFORONE when calling recvmsg 

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>
Cc: stable@kernel.org [2.6.34+]
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Anton Blanchard 2011-05-17 15:38:57 -04:00 committed by David S. Miller
parent 30b9284db3
commit b9eb8b8752
1 changed files with 4 additions and 2 deletions
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6
net/socket.c
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@ -2122,14 +2122,16 @@ int __sys_recvmmsg(int fd, struct mmsghdr __user *mmsg, unsigned int vlen,
*/
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);