linux-kernel - Re: [PATCH v2 01/45] arm_mpam: Stop using uninitialized variables in __ris_msmon

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Message-ID: <20251223115801.000033cb@huawei.com>
Date: Tue, 23 Dec 2025 11:58:01 +0000
From: Jonathan Cameron <jonathan.cameron@...wei.com>
To: Ben Horgan <ben.horgan@....com>
CC: <amitsinght@...vell.com>, <baisheng.gao@...soc.com>,
	<baolin.wang@...ux.alibaba.com>, <carl@...amperecomputing.com>,
	<dave.martin@....com>, <david@...nel.org>, <dfustini@...libre.com>,
	<fenghuay@...dia.com>, <gshan@...hat.com>, <james.morse@....com>,
	<kobak@...dia.com>, <lcherian@...vell.com>,
	<linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
	<peternewman@...gle.com>, <punit.agrawal@....qualcomm.com>,
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	<corbet@....net>, <maz@...nel.org>, <oupton@...nel.org>,
	<joey.gouly@....com>, <suzuki.poulose@....com>, <kvmarm@...ts.linux.dev>,
	kernel test robot <lkp@...el.com>, Dan Carpenter <dan.carpenter@...aro.org>
Subject: Re: [PATCH v2 01/45] arm_mpam: Stop using uninitialized variables
 in __ris_msmon_read()

On Fri, 19 Dec 2025 18:11:03 +0000
Ben Horgan <ben.horgan@....com> wrote:

> Dan has reported two uses of uninitialized variables in __ris_msmon_read().
> If an unknown monitor type is encountered then the local variable, now, is
> used uninitialized. Fix this by returning early on error. If a non-mbwu
> monitor is being read then the local variable, overflow, is not initialized
> but still read. Initialize it to false as overflow is not relevant for csu
> monitors.
> 
> Reported-by: kernel test robot <lkp@...el.com>
> Reported-by: Dan Carpenter <dan.carpenter@...aro.org>
> Closes: https://lore.kernel.org/r/202512091519.RBwiJcSq-lkp@intel.com/
> Closes: https://lore.kernel.org/r/202512100547.N7QPYgfb-lkp@intel.com/
> Signed-off-by: Ben Horgan <ben.horgan@....com>
Reviewed-by: Jonathan Cameron <jonathan.cameron@...wei.com>