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From bc0b56b8703e7e02af745af28bc6fff48ab806ba Mon Sep 17 00:00:00 2001
From: Natanael Copa <ncopa@alpinelinux.org>
Date: Wed, 2 Mar 2016 10:46:49 +0100
Subject: [PATCH] fix stack overflow in epoll waiter

musl libc has a default thread stack of 80k. avoid overflow the stack by
allocating the epol_event array on heap instead of stack.
---
 bin/varnishd/waiter/cache_waiter_epoll.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/bin/varnishd/waiter/cache_waiter_epoll.c b/bin/varnishd/waiter/cache_waiter_epoll.c
index f50ae46..65719e5 100644
--- a/bin/varnishd/waiter/cache_waiter_epoll.c
+++ b/bin/varnishd/waiter/cache_waiter_epoll.c
@@ -71,7 +71,7 @@ struct vwe {
 static void *
 vwe_thread(void *priv)
 {
-	struct epoll_event ev[NEEV], *ep;
+	struct epoll_event *ev, *ep;
 	struct waited *wp;
 	struct waiter *w;
 	double now, then;
@@ -83,6 +83,8 @@ vwe_thread(void *priv)
 	w = vwe->waiter;
 	CHECK_OBJ_NOTNULL(w, WAITER_MAGIC);
 	THR_SetName("cache-epoll");
+	ev = malloc(NEEV * sizeof(struct epoll_event));
+	assert(ev != NULL);
 
 	now = VTIM_real();
 	while (1) {
@@ -146,6 +148,7 @@ vwe_thread(void *priv)
 	AZ(close(vwe->pipe[0]));
 	AZ(close(vwe->pipe[1]));
 	AZ(close(vwe->epfd));
+	free(ev);
 	return (NULL);
 }
 
-- 
2.7.2