From 0bfbf7613bf73c6d6be7d9020a0504ccb81cb07c Mon Sep 17 00:00:00 2001
From: Alchan Kim <a9413miky@gmail.com>
Date: Wed, 13 May 2015 19:42:31 +0900
Subject: [PATCH] plugin/ugreen: Fix error handling for mmap()

---
 plugins/ugreen/ugreen.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/plugins/ugreen/ugreen.c b/plugins/ugreen/ugreen.c
index aed78205..dcaae7bb 100644
--- a/plugins/ugreen/ugreen.c
+++ b/plugins/ugreen/ugreen.c
@@ -99,15 +99,14 @@ static int u_green_init() {
 
 
 	for(i=0;i<uwsgi.async;i++) {
-
 		getcontext(&ug.contexts[i]);
-
-		ug.contexts[i].uc_stack.ss_sp = mmap(NULL, ug.u_stack_size + (uwsgi.page_size*2) , PROT_READ | PROT_WRITE | PROT_EXEC, MAP_ANON | MAP_PRIVATE, -1, 0) + uwsgi.page_size;
-
-		if (ug.contexts[i].uc_stack.ss_sp == MAP_FAILED) {
+		void *page_base_ptr = mmap(NULL, ug.u_stack_size + (uwsgi.page_size*2) , PROT_READ | PROT_WRITE | PROT_EXEC, MAP_ANON | MAP_PRIVATE, -1, 0);
+		if (page_base_ptr == MAP_FAILED) {
 			uwsgi_error("mmap()");
 			exit(1);
 		}
+		ug.contexts[i].uc_stack.ss_sp = page_base_ptr + uwsgi.page_size;
+
 		// set guard pages for stack
 		if (mprotect(ug.contexts[i].uc_stack.ss_sp - uwsgi.page_size, uwsgi.page_size, PROT_NONE)) {
 			uwsgi_error("mprotect()");