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libvhost-user: fix SLAVE_SEND_FD handling 

It doesn't look like this could possibly work properly since
VHOST_USER_PROTOCOL_F_SLAVE_SEND_FD is defined to 10, but the
dev->protocol_features has a bitmap. I suppose the peer this
was tested with also supported VHOST_USER_PROTOCOL_F_LOG_SHMFD,
in which case the test would always be false, but nevertheless
the code seems wrong.

Use has_feature() to fix this.

Fixes: d84599f56c ("libvhost-user: support host notifier")
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Message-Id: <20190903200422.11693-1-johannes@sipsolutions.net>
Reviewed-by: Tiwei Bie <tiwei.bie@intel.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
stable-4.2
Johannes Berg 2019-09-03 23:04:22 +03:00 committed by Michael S. Tsirkin
parent eb1556c493
commit 8726b70b44
1 changed files with 2 additions and 1 deletions
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3
contrib/libvhost-user/libvhost-user.c
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@ -1097,7 +1097,8 @@ bool vu_set_queue_host_notifier(VuDev *dev, VuVirtq *vq, int fd,
vmsg.fd_num = fd_num;
if ((dev->protocol_features & VHOST_USER_PROTOCOL_F_SLAVE_SEND_FD) == 0) {
if (!has_feature(dev->protocol_features,
VHOST_USER_PROTOCOL_F_SLAVE_SEND_FD)) {
return false;
}