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Date:      Thu, 19 Apr 2012 12:43:20 +0000 (UTC)
From:      Michael Tuexen <tuexen@FreeBSD.org>
To:        src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org
Subject:   svn commit: r234459 - head/sys/netinet
Message-ID:  <201204191243.q3JChKR4089305@svn.freebsd.org>
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Author: tuexen
Date: Thu Apr 19 12:43:19 2012
New Revision: 234459
URL: http://svn.freebsd.org/changeset/base/234459

Log:
  Fix a bug where we copy out more data from a mbuf chain that are
  actually in it. This happens when SCTP receives an unknown chunk, which
  requires the sending of an ERROR chunk, and there is no final padding but
  the chunk is not 4-byte aligned.
  Reported by yueting via rwatson@
  
  MFC after: 3 days

Modified:
  head/sys/netinet/sctp_indata.c
  head/sys/netinet/sctp_input.c

Modified: head/sys/netinet/sctp_indata.c
==============================================================================
--- head/sys/netinet/sctp_indata.c	Thu Apr 19 12:30:12 2012	(r234458)
+++ head/sys/netinet/sctp_indata.c	Thu Apr 19 12:43:19 2012	(r234459)
@@ -2746,11 +2746,13 @@ sctp_process_data(struct mbuf **mm, int 
 						phd->param_length =
 						    htons(chk_length + sizeof(*phd));
 						SCTP_BUF_LEN(merr) = sizeof(*phd);
-						SCTP_BUF_NEXT(merr) = SCTP_M_COPYM(m, *offset,
-						    SCTP_SIZE32(chk_length),
-						    M_DONTWAIT);
+						SCTP_BUF_NEXT(merr) = SCTP_M_COPYM(m, *offset, chk_length, M_DONTWAIT);
 						if (SCTP_BUF_NEXT(merr)) {
-							sctp_queue_op_err(stcb, merr);
+							if (sctp_pad_lastmbuf(SCTP_BUF_NEXT(merr), SCTP_SIZE32(chk_length) - chk_length, NULL)) {
+								sctp_m_freem(merr);
+							} else {
+								sctp_queue_op_err(stcb, merr);
+							}
 						} else {
 							sctp_m_freem(merr);
 						}

Modified: head/sys/netinet/sctp_input.c
==============================================================================
--- head/sys/netinet/sctp_input.c	Thu Apr 19 12:30:12 2012	(r234458)
+++ head/sys/netinet/sctp_input.c	Thu Apr 19 12:43:19 2012	(r234459)
@@ -5461,23 +5461,26 @@ process_control_chunks:
 					phd->param_type = htons(SCTP_CAUSE_UNRECOG_CHUNK);
 					phd->param_length = htons(chk_length + sizeof(*phd));
 					SCTP_BUF_LEN(mm) = sizeof(*phd);
-					SCTP_BUF_NEXT(mm) = SCTP_M_COPYM(m, *offset, SCTP_SIZE32(chk_length),
-					    M_DONTWAIT);
+					SCTP_BUF_NEXT(mm) = SCTP_M_COPYM(m, *offset, chk_length, M_DONTWAIT);
 					if (SCTP_BUF_NEXT(mm)) {
+						if (sctp_pad_lastmbuf(SCTP_BUF_NEXT(mm), SCTP_SIZE32(chk_length) - chk_length, NULL)) {
+							sctp_m_freem(mm);
+						} else {
 #ifdef SCTP_MBUF_LOGGING
-						if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
-							struct mbuf *mat;
+							if (SCTP_BASE_SYSCTL(sctp_logging_level) & SCTP_MBUF_LOGGING_ENABLE) {
+								struct mbuf *mat;
 
-							mat = SCTP_BUF_NEXT(mm);
-							while (mat) {
-								if (SCTP_BUF_IS_EXTENDED(mat)) {
-									sctp_log_mb(mat, SCTP_MBUF_ICOPY);
+								mat = SCTP_BUF_NEXT(mm);
+								while (mat) {
+									if (SCTP_BUF_IS_EXTENDED(mat)) {
+										sctp_log_mb(mat, SCTP_MBUF_ICOPY);
+									}
+									mat = SCTP_BUF_NEXT(mat);
 								}
-								mat = SCTP_BUF_NEXT(mat);
 							}
-						}
 #endif
-						sctp_queue_op_err(stcb, mm);
+							sctp_queue_op_err(stcb, mm);
+						}
 					} else {
 						sctp_m_freem(mm);
 					}

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