From 45ee985fda7a8a80657fbe777ff47c558425c558 Mon Sep 17 00:00:00 2001
From: krangelov <kr.angelov@gmail.com>
Date: Wed, 13 Oct 2021 21:33:55 +0200
Subject: [PATCH] safe error reporting in case of mmap failure

---
 src/runtime/c/pgf/db.cxx | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/runtime/c/pgf/db.cxx b/src/runtime/c/pgf/db.cxx
index 4ebb39d03..889d1aaf5 100644
--- a/src/runtime/c/pgf/db.cxx
+++ b/src/runtime/c/pgf/db.cxx
@@ -327,6 +327,7 @@ PgfDB::PgfDB(const char* filepath, int flags, int mode) {
     ms = (malloc_state*)
         mmap(NULL, file_size, PROT_READ | PROT_WRITE, mflags, fd, 0);
     if (ms == MAP_FAILED) {
+        ms = NULL; // mark that ms is not created.
         ::free((void *) this->filepath);
         int code = errno;
         close(fd);