linux-kernel - [008/165] net: recvmmsg: Strip MSG

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Date:	Wed, 01 Jun 2011 17:09:38 +0900
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Anton Blanchard <anton@...ba.org>,
	"David S. Miller" <davem@...emloft.net>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: [008/165] net: recvmmsg: Strip MSG_WAITFORONE when calling recvmsg

2.6.39-stable review patch.  If anyone has any objections, please let us know.

------------------
Content-Length: 1333
Lines: 44

From: Anton Blanchard <anton@...ba.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@...ba.org>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

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

--- a/net/socket.c
+++ b/net/socket.c
@@ -2122,14 +2122,16 @@ 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);


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