[Contiki-developers] uIP6 -> tcpip_icmp6_call, icmp6_new problem

[Henrik M. <hen...@gm...>]

Hi,

I have a problem when using the uip6 stack. When I receive icmpv6 packets of
type 135 the tcpip_icmp6_call function located in tcpip.c is called. If I
understand it correctly the icmp6_new function is never called by default so
the "uip_icmp6_conns.appstate.p" should be NULL. Which it is for me. The
problem occurs when process_post_synch(uip_icmp6_conns.appstate.p, type, 0)
is called inside tcpip_icmp6_call. process_post_synch inturns calls
call_process() whichs does some checks on the uip_icmp6_conns.appstate.p
structure members. All of these tests pass which makes the call_process
function execute uip_icmp6_conns.appstate.p->thread. This will make the
program crash because the uip_icmp6_conns.appstate.p points to NULL which in
turns make its members invalid.

I don't know if the compiler is not handling this correctly (which I don't
think because this is a runtime problem) or if there should be a test inside
process_call that checks input "struct process *p" if it is a pointer to
NULL or maybe doing this test in tcpip_icmp6_call?

I'm using RF230 together with sicslowpan and the Renesas M16c/62p mcu with
GCC.

Cheers,
Henrik