net: Make skb_ext_put_mctp() idempotent

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The MCTP flow extension can be released either when it is deleted from an
skb or when the last skb holding the extension block is freed. Handle the
release in __skb_ext_del(), which is currently missing, and make
skb_ext_put_mctp() safe to call from both paths.

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

Suggested-by: Florian Westphal <fw@strlen.de>
Signed-off-by: Jakub Sitnicki <jakub@cloudflare.com>
Acked-by: Jeremy Kerr <jk@codeconstruct.com.au>
Link: https://patch.msgid.link/20260831-skb-ext-prep-work-v1-2-ecc2a8542fd9@cloudflare.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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Jakub Sitnicki 2026-08-31 08:27:39 +02:00 • committed by Jakub Kicinski

parent d7470cba6d

commit dbe45b209e

1 changed files with 16 additions and 6 deletions

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net/core/skbuff.c

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