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TSCH: add argument validation in tsch_schedule_add_link()

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The purpose is to avoid allocating a meaningless link, which could cause
communication issue with a peer.
This commit is contained in:
Yasuyuki Tanaka 2017-07-12 12:08:30 +09:00
parent a5a0505d54
commit 4ba8b2e684
1 changed files with 10 additions and 0 deletions
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10
os/net/mac/tsch/tsch-schedule.c
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@ -180,6 +180,16 @@ tsch_schedule_add_link(struct tsch_slotframe *slotframe,
struct tsch_link *l = NULL; struct tsch_link *l = NULL;
if(slotframe != NULL) { if(slotframe != NULL) {
/* We currently support only one link per timeslot in a given slotframe. */ /* We currently support only one link per timeslot in a given slotframe. */
/* Validation of specified timeslot and channel_offset */
if(timeslot > (slotframe->size.val - 1)) {
LOG_ERR("! add_link invalid timeslot: %u\n", timeslot);
return NULL;
} else if(channel_offset > 15) {
LOG_ERR("! add_link invalid channel_offset: %u\n", channel_offset);
return NULL;
}
/* Start with removing the link currently installed at this timeslot (needed /* Start with removing the link currently installed at this timeslot (needed
* to keep neighbor state in sync with link options etc.) */ * to keep neighbor state in sync with link options etc.) */
tsch_schedule_remove_link_by_timeslot(slotframe, timeslot); tsch_schedule_remove_link_by_timeslot(slotframe, timeslot);