linux-kernel - Re: [PATCH v4] cxl: Fix possible null pointer dereference in read

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Message-ID: <2024071537-schematic-envoy-4272@gregkh>
Date: Mon, 15 Jul 2024 15:32:43 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: Markus Elfring <Markus.Elfring@....de>
Cc: make24@...as.ac.cn, linuxppc-dev@...ts.ozlabs.org,
	kernel-janitors@...r.kernel.org, stable@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>,
	Aleksandr Mishin <amishin@...rgos.ru>,
	Andrew Donnellan <ajd@...ux.ibm.com>, Arnd Bergmann <arnd@...db.de>,
	Frederic Barrat <fbarrat@...ux.ibm.com>,
	Ian Munsie <imunsie@....ibm.com>,
	Maxime Ripard <mripard@...nel.org>,
	Michael Ellerman <mpe@...erman.id.au>,
	Shuah Khan <shuah@...nel.org>, Wei Liu <wei.liu@...nel.org>
Subject: Re: [PATCH v4] cxl: Fix possible null pointer dereference in
 read_handle()

On Mon, Jul 15, 2024 at 03:18:56PM +0200, Markus Elfring wrote:
> > In read_handle(), of_get_address() may return NULL if getting address and
> > size of the node failed. When of_read_number() uses prop to handle
> > conversions between different byte orders, it could lead to a null pointer
> > dereference. Add NULL check to fix potential issue.
> >
> > Found by static analysis.
> >
> > Cc: stable@...r.kernel.org
> > Fixes: 14baf4d9c739 ("cxl: Add guest-specific code")
> > Signed-off-by: Ma Ke <make24@...as.ac.cn>
> 
> How will interests evolve for caring more according to known research
> and development processes?
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/process/submitting-patches.rst?h=v6.10#n398
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/process/researcher-guidelines.rst?h=v6.10#n5
> 
> 
> > ---
> > Changes in v4:
> > - modified vulnerability description according to suggestions, making the
> > process of static analysis of vulnerabilities clearer. No active research
> > on developer behavior.
> …
> 
> Does such information indicate any communication difficulties?


Hi,

This is the semi-friendly patch-bot of Greg Kroah-Hartman.

Markus, you seem to have sent a nonsensical or otherwise pointless
review comment to a patch submission on a Linux kernel developer mailing
list.  I strongly suggest that you not do this anymore.  Please do not
bother developers who are actively working to produce patches and
features with comments that, in the end, are a waste of time.

Patch submitter, please ignore Markus's suggestion; you do not need to
follow it at all.  The person/bot/AI that sent it is being ignored by
almost all Linux kernel maintainers for having a persistent pattern of
behavior of producing distracting and pointless commentary, and
inability to adapt to feedback.  Please feel free to also ignore emails
from them.

thanks,

greg k-h's patch email bot