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diff --git a/nametoaddr.c b/nametoaddr.c
index 53070a28..13bf4c68 100644
--- nametoaddr.c
+++ nametoaddr.c
@@ -674,8 +674,15 @@ __pcap_atoin(const char *s, bpf_u_int32 *addr)
len = 0;
for (;;) {
n = 0;
- while (*s && *s != '.')
+ while (*s && *s != '.') {
+ if (n > 25) {
+ /* The result will be > 255 */
+ return -1;
+ }
n = n * 10 + *s++ - '0';
+ }
+ if (n > 255)
+ return -1;
*addr <<= 8;
*addr |= n & 0xff;
len += 8;
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