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RPL: fix a bug accessing an uninitialized pointer 

This bug is uncovered when RPL_WITH_MULTICAST is enabled.
contiki
Yasuyuki Tanaka 2017-02-07 23:59:17 +01:00
parent 3559402781
commit faeb71de00
1 changed files with 26 additions and 17 deletions
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43
core/net/rpl/rpl-icmp6.c
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@ -748,6 +748,11 @@ dao_input_storing(void)
#if RPL_WITH_MULTICAST
if(uip_is_addr_mcast_global(&prefix)) {
/*
* "rep" is used for a unicast route which we don't need now; so set NULL so
* that operations on "rep" will be skipped.
*/
rep = NULL;
mcast_group = uip_mcast6_route_add(&prefix);
if(mcast_group) {
mcast_group->dag = dag;
@ -844,29 +849,33 @@ fwd_dao:
int should_ack = 0;
if(flags & RPL_DAO_K_FLAG) {
/*
* check if this route is already installed and we can ack now!
* not pending - and same seq-no means that we can ack.
* (e.g. the route is installed already so it will not take any
* more room that it already takes - so should be ok!)
*/
if((!RPL_ROUTE_IS_DAO_PENDING(rep) &&
rep->state.dao_seqno_in == sequence) ||
dag->rank == ROOT_RANK(instance)) {
should_ack = 1;
if(rep != NULL) {
/*
* check if this route is already installed and we can ack now!
* not pending - and same seq-no means that we can ack.
* (e.g. the route is installed already so it will not take any
* more room that it already takes - so should be ok!)
*/
if((!RPL_ROUTE_IS_DAO_PENDING(rep) &&
rep->state.dao_seqno_in == sequence) ||
dag->rank == ROOT_RANK(instance)) {
should_ack = 1;
}
}
}
if(dag->preferred_parent != NULL &&
rpl_get_parent_ipaddr(dag->preferred_parent) != NULL) {
uint8_t out_seq = 0;
/* if this is pending and we get the same seq no it is a retrans */
if(RPL_ROUTE_IS_DAO_PENDING(rep) &&
rep->state.dao_seqno_in == sequence) {
/* keep the same seq-no as before for parent also */
out_seq = rep->state.dao_seqno_out;
} else {
out_seq = prepare_for_dao_fwd(sequence, rep);
if(rep != NULL) {
/* if this is pending and we get the same seq no it is a retrans */
if(RPL_ROUTE_IS_DAO_PENDING(rep) &&
rep->state.dao_seqno_in == sequence) {
/* keep the same seq-no as before for parent also */
out_seq = rep->state.dao_seqno_out;
} else {
out_seq = prepare_for_dao_fwd(sequence, rep);
}
}
PRINTF("RPL: Forwarding DAO to parent ");