Author: kib Date: Fri Jul 19 20:51:39 2019 New Revision: 350156 URL: https://svnweb.freebsd.org/changeset/base/350156
Log: Fix leak of memory and file refs with sendmsg(2) over unix domain sockets. When sendmsg(2) sucessfully internalized one SCM_RIGHTS control message, but failed to process some other control message later, both file references and filedescent memory needs to be freed. This was not done, only mbuf chain was freed. Noted, test case written, reviewed by: markj Sponsored by: The FreeBSD Foundation MFC after: 1 week Differential revision: https://reviews.freebsd.org/D21000 Modified: head/sys/kern/uipc_usrreq.c Modified: head/sys/kern/uipc_usrreq.c ============================================================================== --- head/sys/kern/uipc_usrreq.c Fri Jul 19 20:47:35 2019 (r350155) +++ head/sys/kern/uipc_usrreq.c Fri Jul 19 20:51:39 2019 (r350156) @@ -2120,30 +2120,53 @@ unp_init(void) UNP_DEFERRED_LOCK_INIT(); } +static void +unp_internalize_cleanup_rights(struct mbuf *control) +{ + struct cmsghdr *cp; + struct mbuf *m; + void *data; + socklen_t datalen; + + for (m = control; m != NULL; m = m->m_next) { + cp = mtod(m, struct cmsghdr *); + if (cp->cmsg_level != SOL_SOCKET || + cp->cmsg_type != SCM_RIGHTS) + continue; + data = CMSG_DATA(cp); + datalen = (caddr_t)cp + cp->cmsg_len - (caddr_t)data; + unp_freerights(data, datalen / sizeof(struct filedesc *)); + } +} + static int unp_internalize(struct mbuf **controlp, struct thread *td) { - struct mbuf *control = *controlp; - struct proc *p = td->td_proc; - struct filedesc *fdesc = p->p_fd; + struct mbuf *control, **initial_controlp; + struct proc *p; + struct filedesc *fdesc; struct bintime *bt; - struct cmsghdr *cm = mtod(control, struct cmsghdr *); + struct cmsghdr *cm; struct cmsgcred *cmcred; struct filedescent *fde, **fdep, *fdev; struct file *fp; struct timeval *tv; struct timespec *ts; - int i, *fdp; void *data; - socklen_t clen = control->m_len, datalen; - int error, oldfds; + socklen_t clen, datalen; + int i, error, *fdp, oldfds; u_int newlen; UNP_LINK_UNLOCK_ASSERT(); + p = td->td_proc; + fdesc = p->p_fd; error = 0; + control = *controlp; + clen = control->m_len; *controlp = NULL; - while (cm != NULL) { + initial_controlp = controlp; + for (cm = mtod(control, struct cmsghdr *); cm != NULL;) { if (sizeof(*cm) > clen || cm->cmsg_level != SOL_SOCKET || cm->cmsg_len > clen || cm->cmsg_len < sizeof(*cm)) { error = EINVAL; @@ -2294,6 +2317,8 @@ unp_internalize(struct mbuf **controlp, struct thread } out: + if (error != 0 && initial_controlp != NULL) + unp_internalize_cleanup_rights(*initial_controlp); m_freem(control); return (error); } _______________________________________________ svn-src-head@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
