From 26ee533303029d3a4b1b18cb21417b6b2e5d71ae Mon Sep 17 00:00:00 2001
From: Nguyen Anh Quynh <aquynh@gmail.com>
Date: Mon, 21 Sep 2015 22:17:26 +0800
Subject: [PATCH] return NULL in memory_mapping() if no memory is mapped. this
 fixes test_bad_unmap in test_x86.c

---
 uc.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/uc.c b/uc.c
index 76a3f5f7..2d97b7c9 100644
--- a/uc.c
+++ b/uc.c
@@ -809,6 +809,9 @@ MemoryRegion *memory_mapping(struct uc_struct* uc, uint64_t address)
 {
     unsigned int i;
 
+    if (uc->mapped_block_count == 0)
+        return NULL;
+
     // try with the cache index first
     i = uc->mapped_block_cache_index;