From d026ce97b8faaa2f3f196281b96df0a04e30e4f9 Mon Sep 17 00:00:00 2001
From: dzwdz
Date: Thu, 21 Oct 2021 06:21:34 +0000
Subject: init/shell: fix crash when cat is ran without arguments

---
 src/init/shell.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

(limited to 'src/init/shell.c')

diff --git a/src/init/shell.c b/src/init/shell.c
index 53ad995..33f6da3 100644
--- a/src/init/shell.c
+++ b/src/init/shell.c
@@ -44,10 +44,13 @@ static int readline(char *buf, size_t max) {
 }
 
 static void cmd_cat(const char *args) {
-	int fd = _syscall_open(args, strlen(args));
+	int fd;
 	static char buf[256];
 	int len = 256;
 
+	if (!args) return; // no argument
+
+	fd = _syscall_open(args, strlen(args));
 	if (fd < 0) {
 		printf("couldn't open.\n");
 		return;
-- 
cgit v1.2.3