Commit cfe8394e authored by Eric Dumazet's avatar Eric Dumazet Committed by Jakub Kicinski
Browse files

net: add debug check in skb_reset_inner_transport_header() 



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

This needs CONFIG_DEBUG_NET=y.

Signed-off-by: default avatarEric Dumazet <edumazet@google.com>
Reviewed-by: default avatarJoe Damato <jdamato@fastly.com>
Reviewed-by: default avatarXuan Zhuo <xuanzhuo@linux.alibaba.com>
Link: https://patch.msgid.link/20241105174403.850330-3-edumazet@google.com


Signed-off-by: default avatarJakub Kicinski <kuba@kernel.org>
parent 1e4033b5

include/linux/skbuff.h

+4 −1
Original line number Diff line number Diff line
@@ -2937,7 +2937,10 @@ static inline int skb_inner_transport_offset(const struct sk_buff *skb) 


static inline void skb_reset_inner_transport_header(struct sk_buff *skb)

{

	skb->inner_transport_header = skb->data - skb->head;

	long offset = skb->data - skb->head;



	DEBUG_NET_WARN_ON_ONCE(offset != (typeof(skb->inner_transport_header))offset);

	skb->inner_transport_header = offset;

}



static inline void skb_set_inner_transport_header(struct sk_buff *skb,