On 15/02/2019 16:03, Tomas Paukrt wrote: > Hi, > > I have recently discovered that kernel 3.12.10 is occasionally crashing > due to NULL pointer dereference in function br_handle_frame when we > reconfigure the bridge, because function br_port_get_rcu returns NULL. > > It is very hard for us to replicate this issue, because it happens about > once per month in our testing environment, but I have created the > attached patch. Can you please check it? The latest kernel seems to be > affected too. > > Best regards > > Tomas >
Hi, That should not be possible, br_port_get_rcu() is a wrapper for dev->rx_handler_data which in turn should always be present in case rx_handler is called as can be seen in netdev_rx_handler_unregister(). Could you please share details about the crash and possibly a trace ? Do you have any custom patches applied ? Thanks, Nik
