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check if preferred parent was set before comparing

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This commit is contained in:
Oleg Hahm 2013-11-22 12:24:46 +01:00
parent de2b71221f
commit 3a05de1ed9
1 changed files with 4 additions and 1 deletions
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5
sys/net/rpl/rpl.c
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@ -715,7 +715,10 @@ void recv_rpl_dio(void)
parent->rank = rpl_dio_buf->rank;
rpl_parent_update(parent);
if (rpl_equal_id(&parent->addr, &my_dodag->my_preferred_parent->addr) && (parent->dtsn != rpl_dio_buf->dtsn)) {
if (my_dodag->my_preferred_parent == NULL) {
DEBUG("my dodag has no preferred_parent yet - seems to be odd since I have a parent...\n");
}
else if (rpl_equal_id(&parent->addr, &my_dodag->my_preferred_parent->addr) && (parent->dtsn != rpl_dio_buf->dtsn)) {
delay_dao();
}