linux-kernel - Re: [PATCH v2] Fixes the null pointer deferences in nsim

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Message-ID: <ZU6ChFruBvEnA0V0@google.com>
Date:   Fri, 10 Nov 2023 11:20:36 -0800
From:   Stanislav Fomichev <sdf@...gle.com>
To:     Jakub Kicinski <kuba@...nel.org>
Cc:     Dipendra Khadka <kdipendra88@...il.com>, davem@...emloft.net,
        edumazet@...gle.com, pabeni@...hat.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        linux-kernel-mentees@...ts.linuxfoundation.org,
        syzbot+44c2416196b7c607f226@...kaller.appspotmail.com,
        Stanislav Fomichev <sdf@...ichev.me>
Subject: Re: [PATCH v2] Fixes the null pointer deferences in nsim_bpf

On 11/10, Jakub Kicinski wrote:
> On Fri, 10 Nov 2023 11:18:23 +0000 Dipendra Khadka wrote:
> > Syzkaller found a null pointer dereference in nsim_bpf
> > originating from the lack of a null check for state.
> > 
> > This patch fixes the issue by adding a check for state
> > in two functions nsim_prog_set_loaded() and nsim_setup_prog_hw_checks()
> > 
> > Reported-by: syzbot+44c2416196b7c607f226@...kaller.appspotmail.com
> > Closes: https://syzkaller.appspot.com./bug?extid=44c2416196b7c607f226
> > Fixes: 31d3ad832948 ("netdevsim: add bpf offload support")
> 
> Don't think so. It's probably due to Stan's extensions / reuse of 
> the offload infra.
> 
> Please put more effort into figuring out when and why this started
> happening. Describe your findings in the commit message.
> 
> Current patch looks too much like a bandaid.
> 
> Before you repost read:
> https://www.kernel.org/doc/html/next/process/maintainer-netdev.html

I agree, I have a similar suspicion for the same report on the bpf list [0].

0: https://lore.kernel.org/bpf/ZU13dQb2z66CJlYi@google.com/