xfrm: hold dev ref until after transport_finish NF_HOOK

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After async crypto completes, xfrm_input_resume() calls dev_put()
immediately on re-entry before the skb reaches transport_finish.
The skb->dev pointer is then used inside NF_HOOK and its okfn,
which can race with device teardown.

Remove the dev_put from the async resumption entry and instead
drop the reference after the NF_HOOK call in transport_finish,
using a saved device pointer since NF_HOOK may consume the skb.
This covers NF_DROP, NF_QUEUE and NF_STOLEN paths that skip
the okfn.

For non-transport exits (decaps, gro, drop) and secondary
async return points, release the reference inline when
async is set.

Suggested-by: Florian Westphal <fw@strlen.de>
Fixes: acf568ee85 ("xfrm: Reinject transport-mode packets through tasklet")
Cc: stable@vger.kernel.org
Signed-off-by: Qi Tang <tpluszz77@gmail.com>
Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>

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This commit is contained in:

Qi Tang 2026-04-02 19:44:01 +08:00 • committed by Steffen Klassert

parent 069daad4f2

commit 1c428b0384

3 changed files with 22 additions and 6 deletions

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5

net/ipv4/xfrm4_input.c

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5

net/ipv6/xfrm6_input.c

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18

net/xfrm/xfrm_input.c

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