From a4784cc96c71e51235044d42c860a840083ad1c8 Mon Sep 17 00:00:00 2001
From: Dominik Maier <domenukk@gmail.com>
Date: Fri, 5 Jun 2020 04:30:23 +0200
Subject: [PATCH] fix error handling of mmap() calls (#1283)

---
 qemu/exec.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/qemu/exec.c b/qemu/exec.c
index e6923862..9e4fa5d1 100644
--- a/qemu/exec.c
+++ b/qemu/exec.c
@@ -1154,7 +1154,7 @@ void qemu_ram_remap(struct uc_struct *uc, ram_addr_t addr, ram_addr_t length)
                     area = mmap(vaddr, length, PROT_READ | PROT_WRITE,
                             flags, -1, 0);
                 }
-                if (area != vaddr) {
+                if (area == MAP_FAILED || area != vaddr) {
                     fprintf(stderr, "Could not remap addr: "
                             RAM_ADDR_FMT "@" RAM_ADDR_FMT "\n",
                             length, addr);