Author: tuexen
Date: Sat Oct  5 12:34:50 2019
New Revision: 353122
URL: https://svnweb.freebsd.org/changeset/base/353122

Log:
  Plumb an mbuf leak found by Mark Wodrich from Google by fuzz testing the
  userland stack and reporting it in:
  https://github.com/sctplab/usrsctp/issues/396
  
  MFC after:            3 days

Modified:
  head/sys/netinet/sctp_input.c

Modified: head/sys/netinet/sctp_input.c
==============================================================================
--- head/sys/netinet/sctp_input.c       Sat Oct  5 10:59:41 2019        
(r353121)
+++ head/sys/netinet/sctp_input.c       Sat Oct  5 12:34:50 2019        
(r353122)
@@ -465,6 +465,10 @@ sctp_process_init_ack(struct mbuf *m, int iphlen, int 
        if (!cookie_found) {
                uint16_t len;
 
+               /* Only report the missing cookie parameter */
+               if (op_err != NULL) {
+                       sctp_m_freem(op_err);
+               }
                len = (uint16_t)(sizeof(struct sctp_error_missing_param) + 
sizeof(uint16_t));
                /* We abort with an error of missing mandatory param */
                op_err = sctp_get_mbuf_for_msg(len, 0, M_NOWAIT, 1, MT_DATA);
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