Author: tuexen Date: Thu Jun 23 19:27:29 2016 New Revision: 302148 URL: https://svnweb.freebsd.org/changeset/base/302148
Log: Fix a bug in the handling of non-blocking SCTP 1-to-1 sockets. When using this code in the userland stack, it could result in a loop. This happened on iOS. However, I was not able to reproduce this when using the code in the kernel. Thanks to Eugen-Andrei Gavriloaie for reporting the issue and proving detailed information to find the root of the problem. Approved by: re (gjb) MFC after: 1 week Modified: head/sys/netinet/sctputil.c Modified: head/sys/netinet/sctputil.c ============================================================================== --- head/sys/netinet/sctputil.c Thu Jun 23 19:24:38 2016 (r302147) +++ head/sys/netinet/sctputil.c Thu Jun 23 19:27:29 2016 (r302148) @@ -5274,8 +5274,14 @@ restart_nosblocks: } } } - if ((so->so_rcv.sb_cc <= held_length) && block_allowed) { - /* we need to wait for data */ + if (so->so_rcv.sb_cc <= held_length) { + if (so->so_error) { + error = so->so_error; + if ((in_flags & MSG_PEEK) == 0) { + so->so_error = 0; + } + goto out; + } if ((so->so_rcv.sb_cc == 0) && ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL))) { @@ -5306,51 +5312,18 @@ restart_nosblocks: goto out; } } - error = sbwait(&so->so_rcv); - if (error) { - goto out; - } - held_length = 0; - goto restart_nosblocks; - } else if (so->so_rcv.sb_cc == 0) { - if (so->so_error) { - error = so->so_error; - if ((in_flags & MSG_PEEK) == 0) - so->so_error = 0; - } else { - if ((inp->sctp_flags & SCTP_PCB_FLAGS_TCPTYPE) || - (inp->sctp_flags & SCTP_PCB_FLAGS_IN_TCPPOOL)) { - if ((inp->sctp_flags & SCTP_PCB_FLAGS_CONNECTED) == 0) { - /* - * For active open side clear flags - * for re-use passive open is - * blocked by connect. - */ - if (inp->sctp_flags & SCTP_PCB_FLAGS_WAS_ABORTED) { - /* - * You were aborted, passive - * side always hits here - */ - SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTPUTIL, ECONNRESET); - error = ECONNRESET; - } - so->so_state &= ~(SS_ISCONNECTING | - SS_ISDISCONNECTING | - SS_ISCONFIRMING | - SS_ISCONNECTED); - if (error == 0) { - if ((inp->sctp_flags & SCTP_PCB_FLAGS_WAS_CONNECTED) == 0) { - SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTPUTIL, ENOTCONN); - error = ENOTCONN; - } - } - goto out; - } + if (block_allowed) { + error = sbwait(&so->so_rcv); + if (error) { + goto out; } + held_length = 0; + goto restart_nosblocks; + } else { SCTP_LTRACE_ERR_RET(inp, NULL, NULL, SCTP_FROM_SCTPUTIL, EWOULDBLOCK); error = EWOULDBLOCK; + goto out; } - goto out; } if (hold_sblock == 1) { SOCKBUF_UNLOCK(&so->so_rcv); _______________________________________________ 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"