linux-kernel - Re: [PATCH v2] lib/group_cpus: fix NULL pointer dereference from group_cpus

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Message-ID: <d03be22a-ff9f-cc1e-7739-7c455c6d9345@huaweicloud.com>
Date: Fri, 20 Jun 2025 09:10:59 +0800
From: Yu Kuai <yukuai1@...weicloud.com>
To: John Garry <john.g.garry@...cle.com>, Yu Kuai <yukuai1@...weicloud.com>,
 tglx@...utronix.de, akpm@...ux-foundation.org, ming.lei@...hat.com,
 axboe@...nel.dk
Cc: linux-kernel@...r.kernel.org, yi.zhang@...wei.com, yangerkun@...wei.com,
 johnny.chenyi@...wei.com, "yukuai (C)" <yukuai3@...wei.com>
Subject: Re: [PATCH v2] lib/group_cpus: fix NULL pointer dereference from
 group_cpus_evenly()

Hi,

在 2025/06/19 22:08, John Garry 写道:
> There's a non-SMP version of group_cpus_evenly() at the bottom of 
> lib/group_cpus.c
> 
> It also does a kcalloc(numgrps, ...)
> 
> Does that need to be fixed as well?

Yes, you're right. Just run the test with SMP disabled, and the problem
can be reporduced as well.

Thanks,
Kuai