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2023-12-08 01573e231f18eb2d99162747186f59511f56b64d

 kernel/net/decnet/sysctl_net_decnet.c
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@@ -75,7 +75,7 @@
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 		case '\r':
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 		case ':':
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 			*str = 0;
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-			/* Fallthrough */
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+			fallthrough;
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 		case 0:
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 			return;
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 		}
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@@ -134,8 +134,7 @@
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 }
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 static int dn_node_address_handler(struct ctl_table *table, int write,
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-				void __user *buffer,
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-				size_t *lenp, loff_t *ppos)
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+		void *buffer, size_t *lenp, loff_t *ppos)
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 {
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 	char addr[DN_ASCBUF_LEN];
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 	size_t len;
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@@ -148,10 +147,7 @@
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 	if (write) {
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 		len = (*lenp < DN_ASCBUF_LEN) ? *lenp : (DN_ASCBUF_LEN-1);
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-
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-		if (copy_from_user(addr, buffer, len))
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-			return -EFAULT;
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-
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+		memcpy(addr, buffer, len);
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 		addr[len] = 0;
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 		strip_it(addr);
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@@ -173,11 +169,9 @@
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 	len = strlen(addr);
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 	addr[len++] = '\n';
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-	if (len > *lenp) len = *lenp;
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-
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-	if (copy_to_user(buffer, addr, len))
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-		return -EFAULT;
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-
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+	if (len > *lenp)
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+		len = *lenp;
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+	memcpy(buffer, addr, len);
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 	*lenp = len;
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 	*ppos += len;
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@@ -185,8 +179,7 @@
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 }
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 static int dn_def_dev_handler(struct ctl_table *table, int write,
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-				void __user *buffer,
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-				size_t *lenp, loff_t *ppos)
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+		void *buffer, size_t *lenp, loff_t *ppos)
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 {
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 	size_t len;
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 	struct net_device *dev;
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@@ -201,9 +194,7 @@
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 		if (*lenp > 16)
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 			return -E2BIG;
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-		if (copy_from_user(devname, buffer, *lenp))
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-			return -EFAULT;
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-
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+		memcpy(devname, buffer, *lenp);
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 		devname[*lenp] = 0;
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 		strip_it(devname);
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@@ -238,9 +229,7 @@
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 	if (len > *lenp) len = *lenp;
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-	if (copy_to_user(buffer, devname, len))
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-		return -EFAULT;
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-
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+	memcpy(buffer, devname, len);
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 	*lenp = len;
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 	*ppos += len;
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