Bluetooth: Fix user channel for 32bit userspace on 64bit kernel

commit ab89f0bdd63a3721f7cd3f064f39fc4ac7ca14d4 upstream.

Running 32bit userspace on 64bit kernel results in MSG_CMSG_COMPAT being
defined as 0x80000000. This results in sendmsg failure if used from 32bit
userspace running on 64bit kernel. Fix this by accounting for MSG_CMSG_COMPAT
in flags check in hci_sock_sendmsg.

Signed-off-by: Szymon Janc <szymon.janc@codecoup.pl>
Signed-off-by: Marko Kiiskila <marko@runtime.io>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/net/bluetooth/hci_sock.c b/net/bluetooth/hci_sock.c
index b1eb8c09a66016c2cbcca79dcf3bb533bb85ec02..c842f40c11734bd1023c2b54aa160e996d66e232 100644 (file)
--- a/net/bluetooth/hci_sock.c
+++ b/net/bluetooth/hci_sock.c
@@ -1164,7 +1164,8 @@ static int hci_sock_sendmsg(struct socket *sock, struct msghdr *msg,
        if (msg->msg_flags & MSG_OOB)
                return -EOPNOTSUPP;
 
-       if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_NOSIGNAL|MSG_ERRQUEUE))
+       if (msg->msg_flags & ~(MSG_DONTWAIT|MSG_NOSIGNAL|MSG_ERRQUEUE|
+                              MSG_CMSG_COMPAT))
                return -EINVAL;
 
        if (len < 4 || len > HCI_MAX_FRAME_SIZE)