Author: vangyzen Date: Fri Feb 10 05:14:19 2017 New Revision: 313523 URL: https://svnweb.freebsd.org/changeset/base/313523
Log: MFC r313401 Fix garbage IP addresses in UDP log_in_vain messages If multiple threads emit a UDP log_in_vain message concurrently, or indeed call inet_ntoa() for any other reason, the IP addresses could be garbage due to concurrent usage of a single string buffer inside inet_ntoa(). Use inet_ntoa_r() with two stack buffers instead. Relnotes: yes Sponsored by: Dell EMC Modified: stable/11/sys/netinet/udp_usrreq.c Directory Properties: stable/11/ (props changed) Modified: stable/11/sys/netinet/udp_usrreq.c ============================================================================== --- stable/11/sys/netinet/udp_usrreq.c Fri Feb 10 04:28:44 2017 (r313522) +++ stable/11/sys/netinet/udp_usrreq.c Fri Feb 10 05:14:19 2017 (r313523) @@ -674,13 +674,13 @@ udp_input(struct mbuf **mp, int *offp, i INPLOOKUP_RLOCKPCB, ifp, m); if (inp == NULL) { if (udp_log_in_vain) { - char buf[4*sizeof "123"]; + char src[INET_ADDRSTRLEN]; + char dst[INET_ADDRSTRLEN]; - strcpy(buf, inet_ntoa(ip->ip_dst)); log(LOG_INFO, "Connection attempt to UDP %s:%d from %s:%d\n", - buf, ntohs(uh->uh_dport), inet_ntoa(ip->ip_src), - ntohs(uh->uh_sport)); + inet_ntoa_r(ip->ip_dst, dst), ntohs(uh->uh_dport), + inet_ntoa_r(ip->ip_src, src), ntohs(uh->uh_sport)); } UDPSTAT_INC(udps_noport); if (m->m_flags & (M_BCAST | M_MCAST)) { _______________________________________________ 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"