linux-kernel - Re: [PATCH 1/7] clk: qcom: gcc-ipq5018: fix terminating of frequency table arrays

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Date: Fri, 1 Mar 2024 14:37:01 +0100
From: Gabor Juhos <j4g8y7@...il.com>
To: Johan Hovold <johan@...nel.org>
Cc: Bjorn Andersson <andersson@...nel.org>,
 Konrad Dybcio <konrad.dybcio@...aro.org>,
 Michael Turquette <mturquette@...libre.com>, Stephen Boyd
 <sboyd@...nel.org>, Sricharan Ramabadhran <quic_srichara@...cinc.com>,
 Varadarajan Narayanan <quic_varada@...cinc.com>,
 Gokul Sriram Palanisamy <quic_gokulsri@...cinc.com>,
 Devi Priya <quic_devipriy@...cinc.com>, Anusha Rao
 <quic_anusha@...cinc.com>, Bryan O'Donoghue <bryan.odonoghue@...aro.org>,
 Georgi Djakov <gdjakov@...sol.com>, linux-arm-msm@...r.kernel.org,
 linux-clk@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/7] clk: qcom: gcc-ipq5018: fix terminating of frequency
 table arrays

Hi Johan,

2024. 03. 01. 10:40 keltezéssel, Johan Hovold írta:
> On Thu, Feb 29, 2024 at 07:07:46PM +0100, Gabor Juhos wrote:
>> The frequency table arrays are supposed to be terminated with an
>> empty element. Add such entry to the end of the arrays where it
>> is missing in order to avoid possible out-of-bound access when
>> the table is traversed by functions like qcom_find_freq() or
>> qcom_find_freq_floor().
>>
>> Fixes: e3fdbef1bab8 ("clk: qcom: Add Global Clock controller (GCC) driver for IPQ5018")
> 
> Good find!
> 
> Looks like these should be backported to the stable kernels as well so
> someone should add:
> 
> Cc: stable@...r.kernel.org
> 
> to all patches except possibly the sc8280xp one (that camera clock
> controller was added in 6.8-rc1 so that patch does not need it in case
> you can these fixes in before 6.8 is released).

You are right maybe, although I did not find strong enough reasons for adding
the stable tags.

Only the changes of the gcc-ipq5018 driver has been tested on real hardware the
others are not. So those does not fit into the "It must be obviously correct and
tested." rule.

Since the support for the IPQ5018 platform is quite incomplete as several
drivers are missing even in 6.8-rc6, it is quite unlikely that anyone uses a
stable kernel for something serious on such boards. Hence backporting the
gcc-ipq5018 changes would not help too much in itself.

Regards,
Gabor