Re: [PATCH v3] riscv: Fix a NULL pointer dereference in machine_kexec_prepare

Tao Liu <[email protected]> Fri, 3 Jul 2026 23:11:11 +1200

Newsgroups	org.kernel.vger.linux-integrity,org.infradead.lists.kexec,org.infradead.lists.linux-riscv,org.kernel.vger.kernel-janitors,org.kernel.vger.linux-kernel
Message-ID	<CAO7dBbW_vxnRiq9QrZK0+nuNUkzOG8qrqYhKqzrz3FdRcayVOw@mail.gmail.com>

Hi Markus,

On Wed, Jul 1, 2026 at 6:01 PM Markus Elfring <[email protected]> wrote:
>
> …
> > Fix this by simply adding a check before copy.
>
>                                            a data copy attempt?
>
>
>
> > Fixes: b7fb4d78a6ad ("RISC-V: use memcpy for kexec_file mode")
>
> See also once more:
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/process/stable-kernel-rules.rst?h=v7.2-rc1#n34
>
>
> Would a summary phrase like “Prevent null pointer dereference in machine_kexec_prepare()”
> be nicer?

Agreed, I will improve it in v4. Thanks again for your guidance!

Thanks,
Tao Liu

>
> Regards,
> Markus
>