svn commit: r345460 - head/sys/netinet

[Michael Tuexen]

Author: tuexen
Date: Sat Mar 23 22:46:29 2019
New Revision: 345460
URL: https://svnweb.freebsd.org/changeset/base/345460

Log:
  Limit the number of bytes which can be queued for SCTP sockets.
  This is joint work with rrs at .
  Reported by:		syzbot+307f167f9bc214f095bc at syzkaller.appspotmail.com
  MFC after:		1 week

Modified:
  head/sys/netinet/sctp_output.c

Modified: head/sys/netinet/sctp_output.c
==============================================================================
--- head/sys/netinet/sctp_output.c	Sat Mar 23 22:44:11 2019	(r345459)
+++ head/sys/netinet/sctp_output.c	Sat Mar 23 22:46:29 2019	(r345460)
@@ -13026,12 +13026,7 @@ sctp_lower_sosend(struct socket *so,
 	/* Calculate the maximum we can send */
 	inqueue_bytes = stcb->asoc.total_output_queue_size - (stcb->asoc.chunks_on_out_queue * SCTP_DATA_CHUNK_OVERHEAD(stcb));
 	if (SCTP_SB_LIMIT_SND(so) > inqueue_bytes) {
-		if (non_blocking) {
-			/* we already checked for non-blocking above. */
-			max_len = sndlen;
-		} else {
-			max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
-		}
+		max_len = SCTP_SB_LIMIT_SND(so) - inqueue_bytes;
 	} else {
 		max_len = 0;
 	}