linux-kernel - Re: [PATCH] net: tls: Fix possible NULL-pointer dereference in tls_decrypt_device() and tls_decrypt

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Message-ID: <20231025143051.6cfe4fc5@kernel.org>
Date:   Wed, 25 Oct 2023 14:30:51 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Sabrina Dubroca <sd@...asysnail.net>
Cc:     Hangyu Hua <hbh25y@...il.com>, borisp@...dia.com,
        john.fastabend@...il.com, davem@...emloft.net, edumazet@...gle.com,
        pabeni@...hat.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: tls: Fix possible NULL-pointer dereference in
 tls_decrypt_device() and tls_decrypt_sw()

On Wed, 25 Oct 2023 23:20:23 +0200 Sabrina Dubroca wrote:
> There's already a comment above tls_decrypt_sg that (pretty much) says
> out_iov is only used in zero-copy mode.
> 
>  *          [...]            The input parameter 'darg->zc' indicates if
>  * zero-copy mode needs to be tried or not. With zero-copy mode, either
>  * out_iov or out_sg must be non-NULL.
> 
> Do we need another just above the call to tls_decrypt_sg?

Sounds good. Right next to a line of code that people will try to
modify when whatever static checker they have tells them this is
buggy :S  Call site of tls_decrypt_sg() seems like a good bet.