From da2ded65755a2e02411931c6dfeb59ad82c60d2d Mon Sep 17 00:00:00 2001
From: Patrick Kelsey <pkelsey@FreeBSD.org>
Date: Thu, 1 Sep 2016 02:05:46 +0000
Subject: [PATCH] _taskqueue_start_threads() now fails if it doesn't actually
 start any threads.

Reviewed by:	jhb
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D7701
---
 sys/kern/subr_taskqueue.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/sys/kern/subr_taskqueue.c b/sys/kern/subr_taskqueue.c
index 5a20148f573..21476e6674c 100644
--- a/sys/kern/subr_taskqueue.c
+++ b/sys/kern/subr_taskqueue.c
@@ -625,6 +625,11 @@ _taskqueue_start_threads(struct taskqueue **tqp, int count, int pri,
 		} else
 			tq->tq_tcount++;
 	}
+	if (tq->tq_tcount == 0) {
+		free(tq->tq_threads, M_TASKQUEUE);
+		tq->tq_threads = NULL;
+		return (ENOMEM);
+	}
 	for (i = 0; i < count; i++) {
 		if (tq->tq_threads[i] == NULL)
 			continue;