linux-kernel - Re: [PATCH] cpufreq: scmi: Fix possible null pointer dereference

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Message-ID: <CALGdzurRtHLOokUH7GOhmkDkzBioDFt1iJ19eSbrjyeWW7p4KA@mail.gmail.com>
Date: Sat, 12 Apr 2025 13:32:10 -0500
From: Chenyuan Yang <chenyuan0y@...il.com>
To: Dan Carpenter <dan.carpenter@...aro.org>
Cc: sudeep.holla@....com, cristian.marussi@....com, rafael@...nel.org, 
	viresh.kumar@...aro.org, arm-scmi@...r.kernel.org, 
	linux-arm-kernel@...ts.infradead.org, linux-pm@...r.kernel.org, 
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] cpufreq: scmi: Fix possible null pointer dereference

On Sat, Apr 12, 2025 at 1:31 PM Dan Carpenter <dan.carpenter@...aro.org> wrote:
>
> On Sat, Apr 12, 2025 at 01:08:31PM -0500, Chenyuan Yang wrote:
> > Check if policy is NULL before dereferencing it.
> >
> > This is similar to the commit cf7de25878a1
> > ("cppc_cpufreq: Fix possible null pointer dereference").
> >
> > This is found by our static analysis tool KNighter.
> >
> > Signed-off-by: Chenyuan Yang <chenyuan0y@...il.com>
> > Fixes: 99d6bdf33877 ("cpufreq: add support for CPU DVFS based on SCMI message protocol")
>
> Henry Martin already fixed this in commit 484d3f15cc6c ("cpufreq: scmi:
> Fix null-ptr-deref in scmi_cpufreq_get_rate()").

Thanks so much for pointing this out!
It is good to hear that there is already a fix.

> regards,
> dan carpenter

-Chenyuan