net: Make skb_ext_put_sp() idempotent

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The sec_path extension can be released either when it is deleted from an
skb or when the last skb holding the extension block is freed. Make
skb_ext_put_sp() safe to call from both paths by returning when
sec_path->len is zero and clearing it after dropping the XFRM state
references.

This will let __skb_ext_put() release the sec_path without checking whether
the extension is present first, which is needed if we want to reuse skb_ext
chunks area after skb scrubbing.

Signed-off-by: Jakub Sitnicki <jakub@cloudflare.com>
Link: https://patch.msgid.link/20260831-skb-ext-prep-work-v1-1-ecc2a8542fd9@cloudflare.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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Jakub Sitnicki 2026-08-31 08:27:38 +02:00 • committed by Jakub Kicinski

parent c8ea08ba34

commit d7470cba6d

1 changed files with 5 additions and 3 deletions

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net/core/skbuff.c

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