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Date:   Fri, 04 Feb 2022 10:40:12 +0000
To:     Jakub Kicinski <>
Subject: Re: [PATCH net-next] tls: cap the output scatter list to something


This patch was applied to netdev/net-next.git (master)
by David S. Miller <>:

On Wed,  2 Feb 2022 14:20:31 -0800 you wrote:
> TLS recvmsg() passes user pages as destination for decrypt.
> The decrypt operation is repeated record by record, each
> record being 16kB, max. TLS allocates an sg_table and uses
> iov_iter_get_pages() to populate it with enough pages to
> fit the decrypted record.
> Even though we decrypt a single message at a time we size
> the sg_table based on the entire length of the iovec.
> This leads to unnecessarily large allocations, risking
> triggering OOM conditions.
> [...]

Here is the summary with links:
  - [net-next] tls: cap the output scatter list to something reasonable

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