Author: cy Date: Sat Dec 21 21:05:53 2019 New Revision: 355990 URL: https://svnweb.freebsd.org/changeset/base/355990
Log: MFV r355890: Fix libpcap issue #893: check for invalid IPv4 addresses. This fixes errors such as: tcpdump -i lagg0 net 999.999.999.999 This was originally discovered on a Red Hat 7.7 server and verified to also be a bug on FreeBSD. Obtained from: https://github.com/the-tcpdump-group/libpcap/commit/ \ 07070918d5e81a515315b395f334e52589fe0fb Fixed by: https://github.com/guyharris MFC after: 2 weeks Modified: head/contrib/libpcap/gencode.c head/contrib/libpcap/nametoaddr.c Directory Properties: head/contrib/libpcap/ (props changed) Modified: head/contrib/libpcap/gencode.c ============================================================================== --- head/contrib/libpcap/gencode.c Sat Dec 21 21:02:50 2019 (r355989) +++ head/contrib/libpcap/gencode.c Sat Dec 21 21:05:53 2019 (r355990) @@ -6955,11 +6955,15 @@ gen_mcode(compiler_state_t *cstate, const char *s1, co 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) @@ -7017,8 +7021,11 @@ gen_ncode(compiler_state_t *cstate, const char *s, bpf 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) { Modified: head/contrib/libpcap/nametoaddr.c ============================================================================== --- head/contrib/libpcap/nametoaddr.c Sat Dec 21 21:02:50 2019 (r355989) +++ head/contrib/libpcap/nametoaddr.c Sat Dec 21 21:05:53 2019 (r355990) @@ -653,8 +653,15 @@ __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; _______________________________________________ svn-src-all@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-all To unsubscribe, send any mail to "svn-src-all-unsubscr...@freebsd.org"
