Date: Fri, 10 Feb 2017 16:11:11 +0000 (UTC) From: Eric van Gyzen <vangyzen@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-10@freebsd.org Subject: svn commit: r313558 - stable/10/sys/netinet Message-ID: <201702101611.v1AGBB7S040430@repo.freebsd.org>
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Author: vangyzen Date: Fri Feb 10 16:11:11 2017 New Revision: 313558 URL: https://svnweb.freebsd.org/changeset/base/313558 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/10/sys/netinet/udp_usrreq.c Directory Properties: stable/10/ (props changed) Modified: stable/10/sys/netinet/udp_usrreq.c ============================================================================== --- stable/10/sys/netinet/udp_usrreq.c Fri Feb 10 16:06:14 2017 (r313557) +++ stable/10/sys/netinet/udp_usrreq.c Fri Feb 10 16:11:11 2017 (r313558) @@ -647,13 +647,13 @@ udp_input(struct mbuf *m, int off) 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)) {
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