From 4f575e202843fbd3afcbbb6d4ea8f6421fd4031b Mon Sep 17 00:00:00 2001
From: YanWQ-monad <YanWQmonad@gmail.com>
Date: Sun, 21 Apr 2024 02:00:52 +0800
Subject: [PATCH] Fix `writev` fault when `io_vec.len` is 0

---
 kernel/aster-nix/src/syscall/writev.rs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/aster-nix/src/syscall/writev.rs b/kernel/aster-nix/src/syscall/writev.rs
index de6a5335..e2e71cd3 100644
--- a/kernel/aster-nix/src/syscall/writev.rs
+++ b/kernel/aster-nix/src/syscall/writev.rs
@@ -41,7 +41,7 @@ fn do_sys_writev(fd: FileDescripter, io_vec_ptr: Vaddr, io_vec_count: usize) ->
     let mut total_len = 0;
     for i in 0..io_vec_count {
         let io_vec = read_val_from_user::<IoVec>(io_vec_ptr + i * core::mem::size_of::<IoVec>())?;
-        if io_vec.base == 0 {
+        if io_vec.base == 0 || io_vec.len == 0 {
             continue;
         }
         let buffer = {