Author: tuexen
Date: Sat Apr  7 17:35:04 2018
New Revision: 332183
URL: https://svnweb.freebsd.org/changeset/base/332183

Log:
  MFC r323372:
  
  Savely remove a chunk from the control queue.
  This bug was found by Coverity scanning the usrsctp library.

Modified:
  stable/11/sys/netinet/sctp_input.c
Directory Properties:
  stable/11/   (props changed)

Modified: stable/11/sys/netinet/sctp_input.c
==============================================================================
--- stable/11/sys/netinet/sctp_input.c  Sat Apr  7 17:06:13 2018        
(r332182)
+++ stable/11/sys/netinet/sctp_input.c  Sat Apr  7 17:35:04 2018        
(r332183)
@@ -3136,14 +3136,14 @@ sctp_handle_ecn_cwr(struct sctp_cwr_chunk *cp, struct 
         * make sure that we have a covered ECNE in the control chunk part.
         * If so remove it.
         */
-       struct sctp_tmit_chunk *chk;
+       struct sctp_tmit_chunk *chk, *nchk;
        struct sctp_ecne_chunk *ecne;
        int override;
        uint32_t cwr_tsn;
 
        cwr_tsn = ntohl(cp->tsn);
        override = cp->ch.chunk_flags & SCTP_CWR_REDUCE_OVERRIDE;
-       TAILQ_FOREACH(chk, &stcb->asoc.control_send_queue, sctp_next) {
+       TAILQ_FOREACH_SAFE(chk, &stcb->asoc.control_send_queue, sctp_next, 
nchk) {
                if (chk->rec.chunk_id.id != SCTP_ECN_ECHO) {
                        continue;
                }
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