From 102a0743326a03cd1a1202ceda21e175b7d3575c Mon Sep 17 00:00:00 2001
From: hc <hc@nodka.com>
Date: Tue, 20 Feb 2024 01:20:52 +0000
Subject: [PATCH] add new system file

---
 kernel/drivers/net/netdevsim/dev.c |    9 +++------
 1 files changed, 3 insertions(+), 6 deletions(-)

diff --git a/kernel/drivers/net/netdevsim/dev.c b/kernel/drivers/net/netdevsim/dev.c
index 9bbecf4..bcf3547 100644
--- a/kernel/drivers/net/netdevsim/dev.c
+++ b/kernel/drivers/net/netdevsim/dev.c
@@ -149,13 +149,10 @@
 	cookie_len = (count - 1) / 2;
 	if ((count - 1) % 2)
 		return -EINVAL;
-	buf = kmalloc(count, GFP_KERNEL | __GFP_NOWARN);
-	if (!buf)
-		return -ENOMEM;
 
-	ret = simple_write_to_buffer(buf, count, ppos, data, count);
-	if (ret < 0)
-		goto free_buf;
+	buf = memdup_user(data, count);
+	if (IS_ERR(buf))
+		return PTR_ERR(buf);
 
 	fa_cookie = kmalloc(sizeof(*fa_cookie) + cookie_len,
 			    GFP_KERNEL | __GFP_NOWARN);

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