Date: Fri, 13 Oct 2023 20:16:42 GMT From: Michael Tuexen <tuexen@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org Subject: git: 8209af15a699 - stable/14 - udp: fix sending of IPv4-mapped addresses Message-ID: <202310132016.39DKGgUC065687@gitrepo.freebsd.org>
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The branch stable/14 has been updated by tuexen: URL: https://cgit.FreeBSD.org/src/commit/?id=8209af15a6994d52276be05380e0c0b7ae117cea commit 8209af15a6994d52276be05380e0c0b7ae117cea Author: Michael Tuexen <tuexen@FreeBSD.org> AuthorDate: 2023-10-07 13:56:00 +0000 Commit: Michael Tuexen <tuexen@FreeBSD.org> CommitDate: 2023-10-13 20:13:44 +0000 udp: fix sending of IPv4-mapped addresses The inp_vflags field must be adjusted during the call of in_pcbbind_setup(). This is consistent with the other places in the code, but not elegant at all. PR: 274009 Reported by: syzbot+81ccc423a2737ed031ac@syzkaller.appspotmail.com Reported by: syzbot+c8e3dac881bba85bc029@syzkaller.appspotmail.com Reviewed by: markj, rrs, rscheff Sponsored by: Netflix, Inc. Differential Revision: https://reviews.freebsd.org/D42031 (cherry picked from commit abca3ae7734f664ee9c5edc7a9d3a17e29180bdb) --- sys/netinet/udp_usrreq.c | 19 +++++++++++++++++-- 1 file changed, 17 insertions(+), 2 deletions(-) diff --git a/sys/netinet/udp_usrreq.c b/sys/netinet/udp_usrreq.c index 70d738bf2108..cbda7f536262 100644 --- a/sys/netinet/udp_usrreq.c +++ b/sys/netinet/udp_usrreq.c @@ -1050,7 +1050,7 @@ udp_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr, int cscov_partial = 0; int ipflags = 0; u_short fport, lport; - u_char tos; + u_char tos, vflagsav; uint8_t pr; uint16_t cscov = 0; uint32_t flowid = 0; @@ -1092,7 +1092,8 @@ udp_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr, * pcb hash. */ if (sin == NULL || - (inp->inp_laddr.s_addr == INADDR_ANY && inp->inp_lport == 0)) + (inp->inp_laddr.s_addr == INADDR_ANY && inp->inp_lport == 0) || + (flags & PRUS_IPV6) != 0) INP_WLOCK(inp); else INP_RLOCK(inp); @@ -1203,10 +1204,17 @@ udp_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr, error = EINVAL; goto release; } + if ((flags & PRUS_IPV6) != 0) { + vflagsav = inp->inp_vflag; + inp->inp_vflag |= INP_IPV4; + inp->inp_vflag &= ~INP_IPV6; + } INP_HASH_WLOCK(pcbinfo); error = in_pcbbind_setup(inp, &src, &laddr.s_addr, &lport, td->td_ucred); INP_HASH_WUNLOCK(pcbinfo); + if ((flags & PRUS_IPV6) != 0) + inp->inp_vflag = vflagsav; if (error) goto release; } @@ -1249,9 +1257,16 @@ udp_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr, inp->inp_lport == 0 || sin->sin_addr.s_addr == INADDR_ANY || sin->sin_addr.s_addr == INADDR_BROADCAST) { + if ((flags & PRUS_IPV6) != 0) { + vflagsav = inp->inp_vflag; + inp->inp_vflag |= INP_IPV4; + inp->inp_vflag &= ~INP_IPV6; + } INP_HASH_WLOCK(pcbinfo); error = in_pcbconnect_setup(inp, sin, &laddr.s_addr, &lport, &faddr.s_addr, &fport, td->td_ucred); + if ((flags & PRUS_IPV6) != 0) + inp->inp_vflag = vflagsav; if (error) { INP_HASH_WUNLOCK(pcbinfo); goto release;
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