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From f88f2ead8cc5958262d333c46e94ddc8a3c9ae18 Mon Sep 17 00:00:00 2001
From: Natanael Copa <ncopa@alpinelinux.org>
Date: Tue, 21 Nov 2017 12:10:34 +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 71c426a..ccbc64c 100644
--- a/bin/varnishd/waiter/cache_waiter_epoll.c
+++ b/bin/varnishd/waiter/cache_waiter_epoll.c
@@ -74,7 +74,7 @@ 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;
@@ -87,6 +87,8 @@ vwe_thread(void *priv)
 	CHECK_OBJ_NOTNULL(w, WAITER_MAGIC);
 	THR_SetName("cache-epoll");
 	THR_Init();
+	ev = malloc(NEEV * sizeof(struct epoll_event));
+	assert(ev != NULL);
 
 	now = VTIM_real();
 	while (1) {
@@ -154,6 +156,7 @@ vwe_thread(void *priv)
 	AZ(close(vwe->pipe[0]));
 	AZ(close(vwe->pipe[1]));
 	AZ(close(vwe->epfd));
+	free(ev);
 	return (NULL);
 }
 
-- 
2.13.5