From 545d815a3b9493ec2dee3f291049b47655c1ec46 Mon Sep 17 00:00:00 2001
From: tuexen <tuexen@FreeBSD.org>
Date: Mon, 9 Sep 2013 21:40:07 +0000
Subject: Fix the aborting of association with the iterator using an empty user
 initiated error cause (using SCTP_ABORT|SCTP_SENDALL).

Approved by: re (delphij)
MFC after: 1 week
---
 sys/netinet/sctp_output.c | 72 +++++++++++++++++++++++------------------------
 1 file changed, 35 insertions(+), 37 deletions(-)

(limited to 'sys/netinet/sctp_output.c')

diff --git a/sys/netinet/sctp_output.c b/sys/netinet/sctp_output.c
index 3d76b7e..34edf5b 100644
--- a/sys/netinet/sctp_output.c
+++ b/sys/netinet/sctp_output.c
@@ -6412,7 +6412,7 @@ sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
 		/* TSNH */
 		return;
 	}
-	if ((ca->m) && ca->sndlen) {
+	if (ca->sndlen > 0) {
 		m = SCTP_M_COPYM(ca->m, 0, M_COPYALL, M_NOWAIT);
 		if (m == NULL) {
 			/* can't copy so we are done */
@@ -6441,38 +6441,40 @@ sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
 	}
 	if (ca->sndrcv.sinfo_flags & SCTP_ABORT) {
 		/* Abort this assoc with m as the user defined reason */
-		if (m) {
+		if (m != NULL) {
+			SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_NOWAIT);
+		} else {
+			m = sctp_get_mbuf_for_msg(sizeof(struct sctp_paramhdr),
+			    0, M_NOWAIT, 1, MT_DATA);
+			SCTP_BUF_LEN(m) = sizeof(struct sctp_paramhdr);
+		}
+		if (m != NULL) {
 			struct sctp_paramhdr *ph;
 
-			SCTP_BUF_PREPEND(m, sizeof(struct sctp_paramhdr), M_NOWAIT);
-			if (m) {
-				ph = mtod(m, struct sctp_paramhdr *);
-				ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
-				ph->param_length = htons(sizeof(struct sctp_paramhdr) + ca->sndlen);
-			}
-			/*
-			 * We add one here to keep the assoc from
-			 * dis-appearing on us.
-			 */
-			atomic_add_int(&stcb->asoc.refcnt, 1);
-			sctp_abort_an_association(inp, stcb, m, SCTP_SO_NOT_LOCKED);
-			/*
-			 * sctp_abort_an_association calls sctp_free_asoc()
-			 * free association will NOT free it since we
-			 * incremented the refcnt .. we do this to prevent
-			 * it being freed and things getting tricky since we
-			 * could end up (from free_asoc) calling inpcb_free
-			 * which would get a recursive lock call to the
-			 * iterator lock.. But as a consequence of that the
-			 * stcb will return to us un-locked.. since
-			 * free_asoc returns with either no TCB or the TCB
-			 * unlocked, we must relock.. to unlock in the
-			 * iterator timer :-0
-			 */
-			SCTP_TCB_LOCK(stcb);
-			atomic_add_int(&stcb->asoc.refcnt, -1);
-			goto no_chunk_output;
+			ph = mtod(m, struct sctp_paramhdr *);
+			ph->param_type = htons(SCTP_CAUSE_USER_INITIATED_ABT);
+			ph->param_length = htons(sizeof(struct sctp_paramhdr) + ca->sndlen);
 		}
+		/*
+		 * We add one here to keep the assoc from dis-appearing on
+		 * us.
+		 */
+		atomic_add_int(&stcb->asoc.refcnt, 1);
+		sctp_abort_an_association(inp, stcb, m, SCTP_SO_NOT_LOCKED);
+		/*
+		 * sctp_abort_an_association calls sctp_free_asoc() free
+		 * association will NOT free it since we incremented the
+		 * refcnt .. we do this to prevent it being freed and things
+		 * getting tricky since we could end up (from free_asoc)
+		 * calling inpcb_free which would get a recursive lock call
+		 * to the iterator lock.. But as a consequence of that the
+		 * stcb will return to us un-locked.. since free_asoc
+		 * returns with either no TCB or the TCB unlocked, we must
+		 * relock.. to unlock in the iterator timer :-0
+		 */
+		SCTP_TCB_LOCK(stcb);
+		atomic_add_int(&stcb->asoc.refcnt, -1);
+		goto no_chunk_output;
 	} else {
 		if (m) {
 			ret = sctp_msg_append(stcb, net, m,
@@ -6566,8 +6568,7 @@ sctp_sendall_iterator(struct sctp_inpcb *inp, struct sctp_tcb *stcb, void *ptr,
 
 	if ((sctp_is_feature_off(inp, SCTP_PCB_FLAGS_NODELAY)) &&
 	    (stcb->asoc.total_flight > 0) &&
-	    (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))
-	    ) {
+	    (un_sent < (int)(stcb->asoc.smallest_mtu - SCTP_MIN_OVERHEAD))) {
 		do_chunk_output = 0;
 	}
 	if (do_chunk_output)
@@ -6696,13 +6697,10 @@ sctp_sendall(struct sctp_inpcb *inp, struct uio *uio, struct mbuf *m,
 		/* Gather the length of the send */
 		struct mbuf *mat;
 
-		mat = m;
 		ca->sndlen = 0;
-		while (m) {
-			ca->sndlen += SCTP_BUF_LEN(m);
-			m = SCTP_BUF_NEXT(m);
+		for (mat = m; mat; mat = SCTP_BUF_NEXT(mat)) {
+			ca->sndlen += SCTP_BUF_LEN(mat);
 		}
-		ca->m = mat;
 	}
 	ret = sctp_initiate_iterator(NULL, sctp_sendall_iterator, NULL,
 	    SCTP_PCB_ANY_FLAGS, SCTP_PCB_ANY_FEATURES,
-- 
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