diff options
| -rw-r--r-- | ffd/neigh.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/ffd/neigh.c b/ffd/neigh.c index 74ff1b5..ca72ccc 100644 --- a/ffd/neigh.c +++ b/ffd/neigh.c @@ -55,7 +55,11 @@ uint16_t ffd_neigh_get_rxcost(const ffd_neigh_t *neigh) { int timediff = timespec_diff(&now, &neigh->last_hello); int shift = (timediff - neigh->hello_interval/2)/neigh->hello_interval; - int received = __builtin_popcount(neigh->hello_log << shift); + + if (shift >= 16) + return 0xffff; + + int received = __builtin_popcount((neigh->hello_log << shift) & 0xffff); if (received == 0) return 0xffff; |