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net: add debug check in skb_reset_transport_header()

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Make sure (skb->data - skb->head) can fit in skb->transport_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/20241105174403.850330-6-edumazet@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Eric Dumazet 2024-11-05 17:44:01 +00:00 committed by Jakub Kicinski
parent 78a0cb2f45
commit ae50ea52bd
1 changed files with 4 additions and 1 deletions
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5
include/linux/skbuff.h
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@ -3007,7 +3007,10 @@ static inline unsigned char *skb_transport_header(const struct sk_buff *skb)
static inline void skb_reset_transport_header(struct sk_buff *skb)
{
skb->transport_header = skb->data - skb->head;
long offset = skb->data - skb->head;
DEBUG_NET_WARN_ON_ONCE(offset != (typeof(skb->transport_header))offset);
skb->transport_header = offset;
}
static inline void skb_set_transport_header(struct sk_buff *skb,