linux-kernel - Re: [PATCH 1/2] OPP: add index check to assert to avoid buffer overflow in _read

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Message-ID: <20241129084052.wfi7nakgcnt3zkur@vireshk-i7>
Date: Fri, 29 Nov 2024 14:10:52 +0530
From: Viresh Kumar <viresh.kumar@...aro.org>
To: Neil Armstrong <neil.armstrong@...aro.org>
Cc: Viresh Kumar <vireshk@...nel.org>, Nishanth Menon <nm@...com>,
	Stephen Boyd <sboyd@...nel.org>,
	Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>,
	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] OPP: add index check to assert to avoid buffer
 overflow in _read_freq()

On 28-11-24, 11:07, Neil Armstrong wrote:
> Pass the freq index to the assert function to make sure
> we do not read a freq out of the opp->rates[] table.
> 
> Without that the index value is never checked when called from
> dev_pm_opp_find_freq_exact_indexed() or
> dev_pm_opp_find_freq_ceil/floor_indexed().

These APIs aren't supported for cases where we have more than one clks
available and hence assert for single clk.

-- 
viresh