ubx.lua: port read/write: check for nil port

kmarkus · Feb 4, 2020 · 82855aa · 82855aa
1 parent 0021628
commit 82855aa
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/lua/ubx.lua.source b/lua/ubx.lua.source
@@ -1107,13 +1107,15 @@ end
 --- Read from a port.
 --
 function M.port_read(p, rval)
+   assert(p, "invalid port")
    if not M.is_data(rval) then
       rval=M.port_alloc_read_sample(p)
    end
    return ubx.__port_read(p, rval), rval
 end
 
 function M.port_write(p, wval)
+   assert(p, "invalid port")
    if M.is_data(wval) then
       ubx.__port_write(p, wval)
    elseif type(wval) == 'cdata' then