In case wpa_supplicant is using driver_macsec_linux, but macsec module
is not (yet) loaded in the kernel, nl_socket_alloc() fails and drv->sk
is NULL. In this case, don't call libnl functions rntl_link_add() or
rtnl_link_change() using such NULL pointer, to prevent program from
getting segmentation faults like:
Program received signal SIGSEGV, Segmentation fault.
nl_socket_get_local_port (sk=sk@entry=0x0) at socket.c:365
365 if (sk->s_local.nl_pid == 0) {
(gdb) p sk
$1 = (const struct nl_sock *) 0x0
(gdb) bt
#0 nl_socket_get_local_port (sk=sk@entry=0x0) at socket.c:365
#1 0x00007ffff79c56a0 in nl_complete_msg (sk=sk@entry=0x0,
msg=msg@entry=0x55555595a1f0) at nl.c:491
#2 0x00007ffff79c56d1 in nl_send_auto (sk=sk@entry=0x0,
msg=msg@entry=0x55555595a1f0) at nl.c:522
#3 0x00007ffff79c652f in nl_send_sync (sk=sk@entry=0x0,
msg=0x55555595a1f0) at nl.c:556
#4 0x00007ffff755faf5 in rtnl_link_add (sk=0x0,
link=link@entry=0x55555595b0f0, flags=flags@entry=1024) at route/link.c:1548
#5 0x000055555567a298 in macsec_drv_create_transmit_sc (priv=0x55555593b130,
sc=0x55555593b320, conf_offset=<optimized out>) at ../src/drivers/driver_macsec_linux.c:998
Signed-off-by: Davide Caratti <davide.caratti@gmail.com>
This uses libnl3 to communicate with the macsec module available on
Linux. A recent enough version of libnl is needed for the macsec.h file
(which is not yet available in a formal libnl release at the time of
this commit).
Signed-off-by: Sabrina Dubroca <sd@queasysnail.net>
