linux-kernel - Re: [PATCH] sched: Fix NULL mm dereference in sched_mm_cid_after

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Message-ID: <b8ce5492-7dd8-4792-b134-b4ccb9187ed4@gmail.com>
Date: Wed, 31 Dec 2025 01:03:28 +0800
From: Qing Wang <wangqing7171@...il.com>
To: xiyou.wangcong@...il.com
Cc: cwang@...tikernel.io, linux-kernel@...r.kernel.org,
 mathieu.desnoyers@...icios.com, peterz@...radead.org, tglx@...utronix.de
Subject: Re: [PATCH] sched: Fix NULL mm dereference in
 sched_mm_cid_after_execve()

>  void sched_mm_cid_after_execve(struct task_struct *t)
>  {
> -    sched_mm_cid_fork(t);
> +    if (t->mm)
> +        sched_mm_cid_fork(t);
>  }

Hi,

It's a correct solution, but I have a small suggestion that putting the 'mm'
checking into sched_mm_cid_fork(), just like sched_mm_cid_exit().

Best regards,
Qing Wang