From: Mike Rapoport <rppt@kernel.org>
To: Hongfu Li <hongfu.li@linux.dev>
Cc: david@kernel.org, osalvador@suse.de, akpm@linux-foundation.org,
linux-mm@kvack.org, linux-cxl@vger.kernel.org,
linux-kernel@vger.kernel.org, Hongfu Li <lihongfu@kylinos.cn>
Subject: Re: [PATCH] mm: add missing alloc_percpu() NULL check in hotplug init
Date: Fri, 17 Jul 2026 09:46:39 +0300 [thread overview]
Message-ID: <alnPz-r76FU6t5Uc@kernel.org> (raw)
In-Reply-To: <20260717052938.58447-1-hongfu.li@linux.dev>
On Fri, Jul 17, 2026 at 01:29:38PM +0800, Hongfu Li wrote:
> From: Hongfu Li <lihongfu@kylinos.cn>
>
> No NULL check is done for alloc_percpu() when initializing per-CPU
> nodestats. Allocation failure leads to NULL pointer dereference
> during later memset.
>
> Make function return int, check alloc_percpu() result and return
> -ENOMEM on error. The caller chain already propagates this error
> correctly.
I already applied a fix from Gregory:
https://patch.msgid.link/20260701221613.2818148-1-gourry@gourry.net
It'll be unstreamed soon.
> Signed-off-by: Hongfu Li <lihongfu@kylinos.cn>
> ---
> include/linux/memory_hotplug.h | 2 +-
> mm/memory_hotplug.c | 3 ++-
> mm/mm_init.c | 14 +++++++++++---
> 3 files changed, 14 insertions(+), 5 deletions(-)
--
Sincerely yours,
Mike.
next prev parent reply other threads:[~2026-07-17 6:46 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-17 5:29 [PATCH] mm: add missing alloc_percpu() NULL check in hotplug init Hongfu Li
2026-07-17 6:46 ` Mike Rapoport [this message]
2026-07-17 7:06 ` Hongfu Li
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