svn commit: r264838 - head/sys/netinet

[Michael Tuexen]

Author: tuexen
Date: Wed Apr 23 21:20:55 2014
New Revision: 264838
URL: http://svnweb.freebsd.org/changeset/base/264838

Log:
  Don't free an mbuf twice. This only happens in very rare error
  cases where the peer sends illegal sequencing information in
  DATA chunks for an existing association.
  
  MFC after: 3 days.

Modified:
  head/sys/netinet/sctp_indata.c

Modified: head/sys/netinet/sctp_indata.c
==============================================================================
--- head/sys/netinet/sctp_indata.c	Wed Apr 23 20:55:07 2014	(r264837)
+++ head/sys/netinet/sctp_indata.c	Wed Apr 23 21:20:55 2014	(r264838)
@@ -1717,6 +1717,9 @@ failed_pdapi_express_del:
 				stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_15;
 				sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
 				*abort_flag = 1;
+				if (last_chunk) {
+					*m = NULL;
+				}
 				return (0);
 			} else {
 				if (sctp_does_tsn_belong_to_reasm(asoc, control->sinfo_tsn)) {
@@ -1733,6 +1736,9 @@ failed_pdapi_express_del:
 					stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_16;
 					sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
 					*abort_flag = 1;
+					if (last_chunk) {
+						*m = NULL;
+					}
 					return (0);
 				}
 			}
@@ -1759,6 +1765,9 @@ failed_pdapi_express_del:
 					stcb->sctp_ep->last_abort_code = SCTP_FROM_SCTP_INDATA + SCTP_LOC_17;
 					sctp_abort_an_association(stcb->sctp_ep, stcb, op_err, SCTP_SO_NOT_LOCKED);
 					*abort_flag = 1;
+					if (last_chunk) {
+						*m = NULL;
+					}
 					return (0);
 				}
 			}
@@ -1822,6 +1831,9 @@ failed_pdapi_express_del:
 			} else {
 				sctp_queue_data_to_stream(stcb, asoc, control, abort_flag);
 				if (*abort_flag) {
+					if (last_chunk) {
+						*m = NULL;
+					}
 					return (0);
 				}
 			}
@@ -1834,7 +1846,9 @@ failed_pdapi_express_del:
 			 * the assoc is now gone and chk was put onto the
 			 * reasm queue, which has all been freed.
 			 */
-			*m = NULL;
+			if (last_chunk) {
+				*m = NULL;
+			}
 			return (0);
 		}
 	}