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net: skb: add compatibility warnings to skb_shift()

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According to current semantics we should never try to shift data
between skbs which differ on decrypted or pp_recycle status.

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Jakub Kicinski 2024-05-30 16:36:16 -07:00 committed by Paolo Abeni
parent 1be68a87ab
commit 99b8add01f
1 changed files with 3 additions and 0 deletions
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3
net/core/skbuff.c
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@ -4139,6 +4139,9 @@ int skb_shift(struct sk_buff *tgt, struct sk_buff *skb, int shiftlen)
if (skb_zcopy(tgt) || skb_zcopy(skb))
return 0;
DEBUG_NET_WARN_ON_ONCE(tgt->pp_recycle != skb->pp_recycle);
DEBUG_NET_WARN_ON_ONCE(skb_cmp_decrypted(tgt, skb));
todo = shiftlen;
from = 0;
to = skb_shinfo(tgt)->nr_frags;