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Defensive programming: check for the argument being NULL.

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This commit is contained in:
Adam Dunkels 2013-08-12 00:19:12 +02:00 committed by Simon Duquennoy
parent b42ccaed1b
commit c52fc2fd19
3 changed files with 28 additions and 4 deletions
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4
core/net/rpl/rpl-dag.c
View File

@ -1022,6 +1022,10 @@ rpl_local_repair(rpl_instance_t *instance)
{ {
int i; int i;
if(instance == NULL) {
PRINTF("RPL: local repair requested for instance NULL\n");
return;
}
PRINTF("RPL: Starting a local instance repair\n"); PRINTF("RPL: Starting a local instance repair\n");
for(i = 0; i < RPL_MAX_DAG_PER_INSTANCE; i++) { for(i = 0; i < RPL_MAX_DAG_PER_INSTANCE; i++) {
if(instance->dag_table[i].used) { if(instance->dag_table[i].used) {

18
core/net/rpl/rpl-icmp6.c
View File

@ -750,9 +750,27 @@ dao_output_target(rpl_parent_t *parent, uip_ipaddr_t *prefix, uint8_t lifetime)
/* Destination Advertisement Object */ /* Destination Advertisement Object */
if(parent == NULL) {
PRINTF("RPL dao_output_target error parent NULL\n");
return;
}
dag = parent->dag; dag = parent->dag;
if(dag == NULL) {
PRINTF("RPL dao_output_target error dag NULL\n");
return;
}
instance = dag->instance; instance = dag->instance;
if(instance == NULL) {
PRINTF("RPL dao_output_target error instance NULL\n");
return;
}
if(prefix == NULL) {
PRINTF("RPL dao_output_target error prefix NULL\n");
return;
}
#ifdef RPL_DEBUG_DAO_OUTPUT #ifdef RPL_DEBUG_DAO_OUTPUT
RPL_DEBUG_DAO_OUTPUT(parent); RPL_DEBUG_DAO_OUTPUT(parent);
#endif #endif

10
core/net/uip-ds6-nbr.c
View File

@ -143,11 +143,13 @@ uip_ds6_nbr_t *
uip_ds6_nbr_lookup(uip_ipaddr_t *ipaddr) uip_ds6_nbr_lookup(uip_ipaddr_t *ipaddr)
{ {
uip_ds6_nbr_t *nbr = nbr_table_head(ds6_neighbors); uip_ds6_nbr_t *nbr = nbr_table_head(ds6_neighbors);
while(nbr != NULL) { if(ipaddr != NULL) {
if(uip_ipaddr_cmp(&nbr->ipaddr, ipaddr)) { while(nbr != NULL) {
return nbr; if(uip_ipaddr_cmp(&nbr->ipaddr, ipaddr)) {
return nbr;
}
nbr = nbr_table_next(ds6_neighbors, nbr);
} }
nbr = nbr_table_next(ds6_neighbors, nbr);
} }
return NULL; return NULL;
} }