diff -ruN vsftpd-3.0.3.orig/sysstr.c vsftpd-3.0.3/sysstr.c

--- vsftpd-3.0.3.orig/sysstr.c	2020-11-17 09:47:03.872923383 +0100

+++ vsftpd-3.0.3/sysstr.c	2020-11-17 09:48:41.219754145 +0100

@@ -74,19 +74,11 @@

 int

 str_open(const struct mystr* p_str, const enum EVSFSysStrOpenMode mode)

 {

-  enum EVSFSysUtilOpenMode open_mode = kVSFSysStrOpenUnknown;

-  switch (mode)

-  {

-    case kVSFSysStrOpenReadOnly:

-      open_mode = kVSFSysUtilOpenReadOnly;

-      break;

-    case kVSFSysStrOpenUnknown:

-      /* Fall through */

-    default:

-      bug("unknown mode value in str_open");

-      break;

-  }

-  return vsf_sysutil_open_file(str_getbuf(p_str), open_mode);

+  if (mode == kVSFSysStrOpenReadOnly)

+    return vsf_sysutil_open_file(str_getbuf(p_str), kVSFSysUtilOpenReadOnly);

+

+  bug("unknown mode value in str_open");

+  return -1;

 }

 int