Don't use a variable length buffer.

diff --git a/src/bpf.c b/src/bpf.c
index b89f7d8212485ae0904a28b74d6a5018fc924e9d..0da4ecad1cfdd5a2b731ae2a0ef645dbad26d444 100644 (file)
--- a/src/bpf.c
+++ b/src/bpf.c
@@ -424,7 +424,7 @@ static const struct bpf_insn bpf_arp_filter [] = {
 int
 bpf_arp(struct interface *ifp, int fd)
 {
-       size_t bpf_hw = ((((size_t)ifp->hwlen / 4) + 2) * 2) + 1;
+       size_t bpf_hw = (((sizeof(ifp->hwlen) / 4) + 2) * 2) + 1;
        struct bpf_insn bpf[3 + bpf_arp_filter_len + bpf_hw + bpf_arp_extra];
        struct bpf_insn *bp;
        struct iarp_state *state;