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

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Message-ID: <0081fcd8-da99-47b2-b136-3ea04232046a@stanley.mountain>
Date: Sat, 12 Apr 2025 21:30:59 +0300
From: Dan Carpenter <dan.carpenter@...aro.org>
To: Chenyuan Yang <chenyuan0y@...il.com>
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 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()").

regards,
dan carpenter