From 123369d6ce2d8d5b8b4c8f70ebad7ce777fb8abc Mon Sep 17 00:00:00 2001
From: "Hui, Chunyang" <sanqian.hcy@antfin.com>
Date: Thu, 22 Jul 2021 11:10:38 +0000
Subject: [PATCH] Fix panic for empty file actions

---
 src/libos/src/process/syscalls.rs | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/libos/src/process/syscalls.rs b/src/libos/src/process/syscalls.rs
index 06a5e4a7..4d005dd6 100644
--- a/src/libos/src/process/syscalls.rs
+++ b/src/libos/src/process/syscalls.rs
@@ -198,6 +198,9 @@ fn clone_file_actions_from_fa_safely(fa_ptr: *const SpawnFileActions) -> Result<
         let fa = unsafe { &*fa_ptr };
         let sa_ptr = fa.actions;
         let sa_len = fa.used as usize;
+        if (sa_ptr == std::ptr::null() && sa_len == 0) {
+            return Ok(file_actions);
+        }
         check_array(sa_ptr, sa_len)?;
         unsafe { std::slice::from_raw_parts(sa_ptr, sa_len) }
     };