netdev - [PATCH net-next] net: warn if transport header was not set

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Message-Id: <20220509165716.745111-1-eric.dumazet@gmail.com>
Date:   Mon,  9 May 2022 09:57:16 -0700
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     "David S . Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Cc:     netdev <netdev@...r.kernel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        Eric Dumazet <eric.dumazet@...il.com>
Subject: [PATCH net-next] net: warn if transport header was not set

From: Eric Dumazet <edumazet@...gle.com>

Make sure skb_transport_header() and skb_transport_offset() uses
are not fooled if the transport header has not been set.

This change will likely expose existing bugs in linux networking stacks.

Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
 include/linux/skbuff.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index d58669d6cb91aa30edc70d59a0a7e9d4e2298842..043c59fa0bd6d921f2d2e211348929681bfce186 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -2804,6 +2804,7 @@ static inline bool skb_transport_header_was_set(const struct sk_buff *skb)
 
 static inline unsigned char *skb_transport_header(const struct sk_buff *skb)
 {
+	WARN_ON_ONCE(!skb_transport_header_was_set(skb));
 	return skb->head + skb->transport_header;
 }
 
-- 
2.36.0.512.ge40c2bad7a-goog