linux-kernel - Re: [PATCH] [RFC] Add missing NULL check in `tls_strp_check_queue

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Date:   Mon, 30 Oct 2023 15:20:05 -0700
From:   Frederik Deweerdt <deweerdt.lkml@...il.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [RFC] Add missing NULL check in `tls_strp_check_queue_ok`

On Mon, Oct 30, 2023 at 03:05:12PM -0700, Jakub Kicinski wrote:
> On Mon, 30 Oct 2023 14:57:29 -0700 Frederik Deweerdt wrote:
> > We see `tls_strp_check_queue_ok` running into a NULL deref when
> > evaluating `TCP_SKB_CB(skb)->seq`.
> > 
> > This commit attempts to address the issue by exiting the loop if
> > skb->next is NULL, and has proven stable under load.
> > 
> > That said i don't understand the code enough to convince myself that
> > the NULL check is indeed required, and i would be happy gather data if
> > that's useful.
> 
> Hm. Can you share the decoded stack trace?

We could only have screen captures from the management console. I've
attached the image to this email.

Frederik

Download attachment "trace.png" of type "image/png" (240647 bytes)