linux-kernel - Re: [PATCH net] tls: fix NULL deref on tls_sw_splice

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Date:   Thu, 23 Nov 2023 17:00:26 +0000
From:   patchwork-bot+netdevbpf@...nel.org
To:     Jann Horn <jannh@...gle.com>
Cc:     borisp@...dia.com, john.fastabend@...il.com, kuba@...nel.org,
        davem@...emloft.net, dhowells@...hat.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH net] tls: fix NULL deref on tls_sw_splice_eof() with empty
 record

Hello:

This patch was applied to netdev/net.git (main)
by Jakub Kicinski <kuba@...nel.org>:

On Wed, 22 Nov 2023 22:44:47 +0100 you wrote:
> syzkaller discovered that if tls_sw_splice_eof() is executed as part of
> sendfile() when the plaintext/ciphertext sk_msg are empty, the send path
> gets confused because the empty ciphertext buffer does not have enough
> space for the encryption overhead. This causes tls_push_record() to go on
> the `split = true` path (which is only supposed to be used when interacting
> with an attached BPF program), and then get further confused and hit the
> tls_merge_open_record() path, which then assumes that there must be at
> least one populated buffer element, leading to a NULL deref.
> 
> [...]

Here is the summary with links:
  - [net] tls: fix NULL deref on tls_sw_splice_eof() with empty record
    https://git.kernel.org/netdev/net/c/53f2cb491b50

You are awesome, thank you!
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