From: Steffen Klassert <steffen.klassert@secunet.com>
To: Zhiling Zou <zhilinz@nebusec.ai>
Cc: <netdev@vger.kernel.org>, <herbert@gondor.apana.org.au>,
<davem@davemloft.net>, <edumazet@kernel.org>, <pabeni@redhat.com>,
<horms@kernel.org>, <vega@nebusec.ai>
Subject: Re: [PATCH net 1/1] xfrm: ipcomp: account full fragment pages in truesize
Date: Fri, 6 Nov 2026 08:47:44 +0100 [thread overview]
Message-ID: <au2GILb3-9bN1i7G@gauss4> (raw)
In-Reply-To: <7f2686a7d3d393a0ef9eb7a2a2abe82caa7874b2.1792692779.git.zhilinz@nebusec.ai>
On Fri, Oct 23, 2026 at 02:32:17AM +0800, Zhiling Zou wrote:
> ipcomp_post_acomp() allocates order-0 pages for decompressed skb
> fragments, but on input charges truesize by the decompressed byte count.
> When the output ends partway through a page, the unused tail of its final
> page is not accounted to the receiving socket. Repeated IPComp packets
> can therefore retain more memory than the socket receive-memory limits
> charge.
>
> Round the decompressed length up to page size when charging input skb
> truesize, matching the pages attached to the skb. Leave output accounting
> unchanged.
>
> Fixes: 7d7e5a60c62e ("ipsec: ipcomp - Decompress into frags if necessary")
> Cc: stable@vger.kernel.org
> Reported-by: Vega <vega@nebusec.ai>
> Link: https://bugtracker.nebusec.ai/f/13830
> Assisted-by: LLM
> Signed-off-by: Zhiling Zou <zhilinz@nebusec.ai>
Applied to the ipsec tree, thanks a lot!
prev parent reply other threads:[~2026-11-06 7:47 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-22 18:32 [PATCH net 0/1] xfrm: ipcomp: account full fragment pages in truesize Zhiling Zou
2026-10-22 18:32 ` [PATCH net 1/1] " Zhiling Zou
2026-11-06 7:47 ` Steffen Klassert [this message]
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