diff options
Diffstat (limited to 'sys/netinet6/icmp6.c')
| -rw-r--r-- | sys/netinet6/icmp6.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/sys/netinet6/icmp6.c b/sys/netinet6/icmp6.c index 4ea9a3a..2b2f6ea 100644 --- a/sys/netinet6/icmp6.c +++ b/sys/netinet6/icmp6.c @@ -1539,8 +1539,12 @@ ni6_nametodns(name, namelen, old) /* result does not fit into mbuf */ if (cp + i + 1 >= ep) goto fail; - /* DNS label length restriction, RFC1035 page 8 */ - if (i >= 64) + /* + * DNS label length restriction, RFC1035 page 8. + * "i == 0" case is included here to avoid returning + * 0-length label on "foo..bar". + */ + if (i <= 0 || i >= 64) goto fail; *cp++ = i; bcopy(p, cp, i); |
