From c3de7191347b8e0adfa93bd656641dba76275ab5 Mon Sep 17 00:00:00 2001
From: Marcus Holland-Moritz <github@mhxnet.de>
Date: Sat, 1 Jul 2023 14:46:32 +0200
Subject: [PATCH] Fix access mode check in open() call

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

diff --git a/src/dwarfs_main.cpp b/src/dwarfs_main.cpp
index 5cd234c1..b712604d 100644
--- a/src/dwarfs_main.cpp
+++ b/src/dwarfs_main.cpp
@@ -466,7 +466,8 @@ int op_open_common(LogProxy& log_, dwarfs_userdata* userdata,
     if (entry) {
       if (entry->is_directory()) {
         err = EISDIR;
-      } else if (fi->flags & (O_APPEND | O_CREAT | O_TRUNC)) {
+      } else if ((fi->flags & O_ACCMODE) != O_RDONLY ||
+                 (fi->flags & (O_APPEND | O_TRUNC)) != 0) {
         err = EACCES;
       } else {
         fi->fh = entry->inode_num();