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qxl: clear guest_cursor on QXL_CURSOR_HIDE 

Make sure we don't leave guest_cursor pointing into nowhere.  This might
lead to (rare) live migration failures, due to target trying to restore
the cursor from the stale pointer.

Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1421788
Reported-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-id: 1488789111-27340-1-git-send-email-kraxel@redhat.com
This commit is contained in:
Gerd Hoffmann 2017-03-06 09:31:51 +01:00
parent ab6b1105a2
commit dbb5fb8d35
1 changed files with 5 additions and 0 deletions
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5
hw/display/qxl.c
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@ -477,6 +477,11 @@ static int qxl_track_command(PCIQXLDevice *qxl, struct QXLCommandExt *ext)
qxl->guest_cursor = ext->cmd.data;
qemu_mutex_unlock(&qxl->track_lock);
}
if (cmd->type == QXL_CURSOR_HIDE) {
qemu_mutex_lock(&qxl->track_lock);
qxl->guest_cursor = 0;
qemu_mutex_unlock(&qxl->track_lock);
}
break;
}
}