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net: add a debug check in __skb_push()

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Add the following check, to detect bugs sooner for CONFIG_DEBUG_NET=y
builds.

	DEBUG_NET_WARN_ON_ONCE(skb->data < skb->head);

Signed-off-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20260130160253.2936789-1-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Eric Dumazet 2026-01-30 16:02:53 +00:00 committed by Jakub Kicinski
parent 87ef8c26ae
commit dc9fd14bd7
1 changed files with 1 additions and 0 deletions
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include/linux/skbuff.h
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@ -2813,6 +2813,7 @@ static inline void *__skb_push(struct sk_buff *skb, unsigned int len)
DEBUG_NET_WARN_ON_ONCE(len > INT_MAX);
skb->data -= len;
DEBUG_NET_WARN_ON_ONCE(skb->data < skb->head);
skb->len += len;
return skb->data;
}