Use InstDir’s parent as target in ChangeDirectoryToSafeDirectory

At script termination, it is more likely that the process has search (execute) permission on InstDir’s parent directory than on the directory containing the SFX file.

Author: shinokaro

src/inst_dir.c

@@ -209,13 +209,18 @@ bool ChangeDirectoryToScriptDirectory(void)
 // Moves the application to a safe directory.
 bool ChangeDirectoryToSafeDirectory(void)
 {
+    if (!IsInstDirSet()) {
+        APP_ERROR("Installation directory has not been set");
+        return false;
+    }
+
     bool changed = false;
     char *working_dir = NULL;
 
-    working_dir = GetTempDirectoryPath();
+    working_dir = GetParentPath(InstDir);
     if (!working_dir) {
-        APP_ERROR("GetTempDirectoryPath failed");
-        
+        APP_ERROR("Failed to get parent path");
+
         goto cleanup;
     }
 
@@ -224,7 +229,7 @@ bool ChangeDirectoryToSafeDirectory(void)
         goto cleanup;
     }
 
-    DEBUG("Failed to change to temporary directory. Trying fallback directory");
+    DEBUG("Failed to change to safe directory. Trying fallback directory");
 
     changed = ChangeWorkingDirectory(FALLBACK_DIRECTORY_PATH);
     if (!changed) {