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diff --git a/gencode.c b/gencode.c
index bdc35e64..040a5531 100644
--- gencode.c
+++ gencode.c
@@ -6947,11 +6947,15 @@ gen_mcode(compiler_state_t *cstate, const char *s1, const char *s2,
return (NULL);
nlen = __pcap_atoin(s1, &n);
+ if (nlen < 0)
+ bpf_error(cstate, "invalid IPv4 address '%s'", s1);
/* Promote short ipaddr */
n <<= 32 - nlen;
if (s2 != NULL) {
mlen = __pcap_atoin(s2, &m);
+ if (mlen < 0)
+ bpf_error(cstate, "invalid IPv4 address '%s'", s2);
/* Promote short ipaddr */
m <<= 32 - mlen;
if ((n & ~m) != 0)
@@ -7009,8 +7013,11 @@ gen_ncode(compiler_state_t *cstate, const char *s, bpf_u_int32 v, struct qual q)
vlen = __pcap_atodn(s, &v);
if (vlen == 0)
bpf_error(cstate, "malformed decnet address '%s'", s);
- } else
+ } else {
vlen = __pcap_atoin(s, &v);
+ if (vlen < 0)
+ bpf_error(cstate, "invalid IPv4 address '%s'", s);
+ }
switch (q.addr) {
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