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2024-05-10 37f49e37ab4cb5d0bc4c60eb5c6d4dd57db767bb

 kernel/net/ipv4/gre_demux.c
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@@ -1,13 +1,8 @@
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+// SPDX-License-Identifier: GPL-2.0-or-later
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 /*
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  *	GRE over IPv4 demultiplexer driver
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  *
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  *	Authors: Dmitry Kozlov (xeb@mail.ru)
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- *
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- *	This program is free software; you can redistribute it and/or
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- *	modify it under the terms of the GNU General Public License
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- *	as published by the Free Software Foundation; either version
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- *	2 of the License, or (at your option) any later version.
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- *
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  */
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7
 
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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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@@ -90,7 +85,7 @@
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 	options = (__be32 *)(greh + 1);
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 	if (greh->flags & GRE_CSUM) {
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 		if (!skb_checksum_simple_validate(skb)) {
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-			skb_checksum_try_convert(skb, IPPROTO_GRE, 0,
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+			skb_checksum_try_convert(skb, IPPROTO_GRE,
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 						 null_compute_pseudo);
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 		} else if (csum_err) {
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 			*csum_err = true;
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@@ -176,20 +171,25 @@
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 	return NET_RX_DROP;
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 }
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-static void gre_err(struct sk_buff *skb, u32 info)
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+static int gre_err(struct sk_buff *skb, u32 info)
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 {
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 	const struct gre_protocol *proto;
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 	const struct iphdr *iph = (const struct iphdr *)skb->data;
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 	u8 ver = skb->data[(iph->ihl<<2) + 1]&0x7f;
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+	int err = 0;
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180
 
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 	if (ver >= GREPROTO_MAX)
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-		return;
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+		return -EINVAL;
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183
 
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 	rcu_read_lock();
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 	proto = rcu_dereference(gre_proto[ver]);
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 	if (proto && proto->err_handler)
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 		proto->err_handler(skb, info);
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+	else
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+		err = -EPROTONOSUPPORT;
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 	rcu_read_unlock();
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+
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+	return err;
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 }
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 static const struct net_protocol net_gre_protocol = {