linux-kernel - Re: [PATCH] net: hsr : Provide fix for HSRv1 supervisor frames decoding

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Message-ID: <20230913163227.ysmJocR0@linutronix.de>
Date:   Wed, 13 Sep 2023 18:32:27 +0200
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     Lukasz Majewski <lukma@...x.de>
Cc:     Tristram.Ha@...rochip.com, Eric Dumazet <edumazet@...gle.com>,
        davem@...emloft.net, Andrew Lunn <andrew@...n.ch>,
        Florian Fainelli <f.fainelli@...il.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Kristian Overskeid <koverskeid@...il.com>,
        Matthieu Baerts <matthieu.baerts@...sares.net>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Andreas Oetken <ennoerlangen@...il.com>
Subject: Re: [PATCH] net: hsr : Provide fix for HSRv1 supervisor frames
 decoding

On 2023-09-12 10:18:28 [+0200], Lukasz Majewski wrote:
> Hi Sebastian,
Hi Lukasz,

> Ok. No problem. Thanks for the information.

So what happens if you try this:

diff --git a/net/hsr/hsr_framereg.c b/net/hsr/hsr_framereg.c
index b77f1189d19d1..6d14d935ee828 100644
--- a/net/hsr/hsr_framereg.c
+++ b/net/hsr/hsr_framereg.c
@@ -288,13 +288,13 @@ void hsr_handle_sup_frame(struct hsr_frame_info *frame)
 
 	/* And leave the HSR tag. */
 	if (ethhdr->h_proto == htons(ETH_P_HSR)) {
-		pull_size = sizeof(struct ethhdr);
+		pull_size = sizeof(struct hsr_tag);
 		skb_pull(skb, pull_size);
 		total_pull_size += pull_size;
 	}
 
 	/* And leave the HSR sup tag. */
-	pull_size = sizeof(struct hsr_tag);
+	pull_size = sizeof(struct hsr_sup_tag);
 	skb_pull(skb, pull_size);
 	total_pull_size += pull_size;
 

Sebastian