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net: add debug check in skb_reset_mac_header()

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Make sure (skb->data - skb->head) can fit in skb->mac_header

This needs CONFIG_DEBUG_NET=y.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Joe Damato <jdamato@fastly.com>
Reviewed-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
Link: https://patch.msgid.link/20241105174403.850330-8-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Eric Dumazet 2024-11-05 17:44:03 +00:00 committed by Jakub Kicinski
parent 305ae87daf
commit 3b6167e9bf
1 changed files with 4 additions and 1 deletions
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5
include/linux/skbuff.h
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@ -3063,7 +3063,10 @@ static inline void skb_unset_mac_header(struct sk_buff *skb)
static inline void skb_reset_mac_header(struct sk_buff *skb)
{
skb->mac_header = skb->data - skb->head;
long offset = skb->data - skb->head;
DEBUG_NET_WARN_ON_ONCE(offset != (typeof(skb->mac_header))offset);
skb->mac_header = offset;
}
static inline void skb_set_mac_header(struct sk_buff *skb, const int offset)