From 23f0453b84be7aec13763b5d8e7976af2a5baa01 Mon Sep 17 00:00:00 2001
From: David du Colombier <0intro@gmail.com>
Date: Tue, 2 Dec 1997 00:00:00 +0000
Subject: [PATCH] Plan 9 from Bell Labs 1997-12-02

---
 port/alloc.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/port/alloc.c b/port/alloc.c
index eaf053e993c2323a1cd3df56d5d1a017cf99990d..f4d7f19e9c9156cbaa26f5d5e2d5af55d1e45aa1 100644
--- a/port/alloc.c
+++ b/port/alloc.c
@@ -186,6 +186,8 @@ poolalloc(Pool *p, int size)
 	Bhdr *q, *t;
 	int alloc, ldr, ns, frag;
 
+	if(size < 0 || size >= 1024*1024*1024)	/* for sanity and to avoid overflow */
+		return nil;
 	size = (size + BHDRSIZE + p->quanta) & ~(p->quanta);
 
 	ilock(&p->l);