linux-kernel - Re: BUG: general protection fault in put

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Message-ID: <CALAgD-5SgEFKD36qtMxWoFci0pLiPxC6Y9Z6rumBr7bGO3x9fQ@mail.gmail.com>
Date: Wed, 28 Aug 2024 16:40:45 -0700
From: Xingyu Li <xli399@....edu>
To: Joel Granados <j.granados@...sung.com>, Yu Hao <yhao016@....edu>
Cc: mcgrof@...nel.org, kees@...nel.org, linux-kernel@...r.kernel.org, 
	linux-fsdevel@...r.kernel.org
Subject: Re: BUG: general protection fault in put_links

We use syzkaller to fuzz the linux kernel, and this bug is triggered
during fuzzing. However, unfortunately, syzkaller did not generate
reproducing source codes.

On Tue, Aug 27, 2024 at 12:50 PM Joel Granados <j.granados@...sung.com> wrote:
>
> On Sat, Aug 24, 2024 at 10:04:54PM -0700, Xingyu Li wrote:
> > Hi,
> >
> > We found a bug in Linux 6.10. It is probably a null pointer reference bug.
> > The reason is probably that before line 123 of
> > fs/proc/proc_sysctl.c(entry = &head->ctl_table[ctl_node -
> > head->node];), there is no null pointer check for `head`.
> > The bug report is as follow:
>
> Thx for the report. How did you trigger it. Do you have code that
> triggers it?
>
> Best
>
> --
>
> Joel Granados



-- 
Yours sincerely,
Xingyu