From c552ec7d61317bbc044e89b94a7a23da09dc61b0 Mon Sep 17 00:00:00 2001
From: "Vanya A. Sergeev" <v@sergeev.io>
Date: Fri, 11 Sep 2020 01:33:01 -0500
Subject: [PATCH] mmio: clear handle ptr on error to prevent spurious munmap()
 in mmio_close()

---
 src/mmio.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/mmio.c b/src/mmio.c
index 78fb8c7..a8e238f 100644
--- a/src/mmio.c
+++ b/src/mmio.c
@@ -80,6 +80,7 @@ int mmio_open(mmio_t *mmio, uintptr_t base, size_t size) {
     if (close(fd) < 0) {
         int errsv = errno;
         munmap(mmio->ptr, mmio->aligned_size);
+        mmio->ptr = 0;
         return _mmio_error(mmio, MMIO_ERROR_OPEN, errsv, "Closing /dev/mem");
     }