luajit-Fix-memory-probing-allocator-to-check-for-valid-end-address.patch

From 646148e747759f0af3b47f9bd287cedd7e174631 Mon Sep 17 00:00:00 2001
From: Mike Pall <mike>
Date: Thu, 13 Sep 2018 17:58:50 +0200
Subject: [PATCH 50/72] Fix memory probing allocator to check for valid end
 address, too.

---
 src/lj_alloc.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/lj_alloc.c b/src/lj_alloc.c
index f3b6a54..33a2eb8 100644
--- a/src/lj_alloc.c
+++ b/src/lj_alloc.c
@@ -255,7 +255,8 @@ static void *mmap_probe(size_t size)
   for (retry = 0; retry < LJ_ALLOC_MMAP_PROBE_MAX; retry++) {
     void *p = mmap((void *)hint_addr, size, MMAP_PROT, MMAP_FLAGS_PROBE, -1, 0);
     uintptr_t addr = (uintptr_t)p;
-    if ((addr >> LJ_ALLOC_MBITS) == 0 && addr >= LJ_ALLOC_MMAP_PROBE_LOWER) {
+    if ((addr >> LJ_ALLOC_MBITS) == 0 && addr >= LJ_ALLOC_MMAP_PROBE_LOWER &&
+	((addr + size) >> LJ_ALLOC_MBITS) == 0) {
       /* We got a suitable address. Bump the hint address. */
       hint_addr = addr + size;
       errno = olderr;
-- 
2.20.1