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Message-ID: <20241105174403.850330-5-edumazet@google.com>
Date: Tue, 5 Nov 2024 17:44:00 +0000
From: Eric Dumazet <edumazet@...gle.com>
To: "David S . Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>,
Paolo Abeni <pabeni@...hat.com>
Cc: netdev@...r.kernel.org, eric.dumazet@...il.com,
Eric Dumazet <edumazet@...gle.com>
Subject: [PATCH net-next 4/7] net: add debug check in skb_reset_inner_mac_header()
Make sure (skb->data - skb->head) can fit in skb->inner_mac_header
This needs CONFIG_DEBUG_NET=y.
Signed-off-by: Eric Dumazet <edumazet@...gle.com>
---
include/linux/skbuff.h | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 8dafd1295a6e921e9fba69b730286ea28fdc5249..32a7d8a65b9f8f6087007177e763dc9498215e34 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -2982,7 +2982,10 @@ static inline unsigned char *skb_inner_mac_header(const struct sk_buff *skb)
static inline void skb_reset_inner_mac_header(struct sk_buff *skb)
{
- skb->inner_mac_header = skb->data - skb->head;
+ long offset = skb->data - skb->head;
+
+ DEBUG_NET_WARN_ON_ONCE(offset != (typeof(skb->inner_mac_header))offset);
+ skb->inner_mac_header = offset;
}
static inline void skb_set_inner_mac_header(struct sk_buff *skb,
--
2.47.0.199.ga7371fff76-goog
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