Date: Sat, 11 Oct 2014 23:24:10 +0000 (UTC) From: Hiroki Sato <hrs@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r272972 - head/usr.sbin/rtadvd Message-ID: <201410112324.s9BNOAPQ055042@svn.freebsd.org>
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Author: hrs Date: Sat Oct 11 23:24:09 2014 New Revision: 272972 URL: https://svnweb.freebsd.org/changeset/base/272972 Log: Check buffer length more strictly. MFC after: 1 day Modified: head/usr.sbin/rtadvd/config.c Modified: head/usr.sbin/rtadvd/config.c ============================================================================== --- head/usr.sbin/rtadvd/config.c Sat Oct 11 23:08:00 2014 (r272971) +++ head/usr.sbin/rtadvd/config.c Sat Oct 11 23:24:09 2014 (r272972) @@ -77,10 +77,10 @@ static time_t prefix_timo = (60 * 120); static struct rtadvd_timer *prefix_timeout(void *); static void makeentry(char *, size_t, int, const char *); -static size_t dname_labelenc(char *, const char *); +static ssize_t dname_labelenc(char *, const char *); /* Encode domain name label encoding in RFC 1035 Section 3.1 */ -static size_t +static ssize_t dname_labelenc(char *dst, const char *src) { char *dst_origin; @@ -90,6 +90,8 @@ dname_labelenc(char *dst, const char *sr dst_origin = dst; len = strlen(src); + if (len + len / 64 + 1 + 1 > DNAME_LABELENC_MAXLEN) + return (-1); /* Length fields per 63 octets + '\0' (<= DNAME_LABELENC_MAXLEN) */ memset(dst, 0, len + len / 64 + 1 + 1); @@ -98,9 +100,13 @@ dname_labelenc(char *dst, const char *sr /* Put a length field with 63 octet limitation first. */ p = strchr(src, '.'); if (p == NULL) - *dst++ = len = MIN(63, len); + *dst = len = MIN(63, len); + else + *dst = len = MIN(63, p - src); + if (dst + 1 + len < dst_origin + DNAME_LABELENC_MAXLEN) + dst++; else - *dst++ = len = MIN(63, p - src); + return (-1); /* Copy 63 octets at most. */ memcpy(dst, src, len); dst += len; @@ -866,6 +872,11 @@ getconfig_free_rdn: abuf[c] = '\0'; ELM_MALLOC(dnsa, goto getconfig_free_dns); dnsa->da_len = dname_labelenc(dnsa->da_dom, abuf); + if (dnsa->da_len < 0) { + syslog(LOG_ERR, "Invalid dnssl entry: %s", + abuf); + goto getconfig_free_dns; + } syslog(LOG_DEBUG, "<%s>: dnsa->da_len = %d", __func__, dnsa->da_len); TAILQ_INSERT_TAIL(&dns->dn_list, dnsa, da_next);
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