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Message-ID: <b3616c67-c65e-d145-c9a3-e6c209849266@linaro.org>
Date: Wed, 31 Mar 2021 18:54:00 +0200
From: Daniel Lezcano <daniel.lezcano@...aro.org>
To: Michael Kao <michael.kao@...iatek.com>, fan.chen@...iatek.com,
Zhang Rui <rui.zhang@...el.com>, linux-pm@...r.kernel.org,
srv_heupstream@...iatek.com
Cc: Eduardo Valentin <edubezval@...il.com>,
Rob Herring <robh+dt@...nel.org>,
Mark Rutland <mark.rutland@....com>,
Matthias Brugger <matthias.bgg@...il.com>, hsinyi@...omium.org,
devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org,
linux-mediatek@...ts.infradead.org,
brian-sy yang <brian-sy.yang@...iatek.com>
Subject: Re: [PATCH v2] thermal: cpufreq_cooling: fix slab OOB issue
On 29/12/2020 06:08, Michael Kao wrote:
> From: brian-sy yang <brian-sy.yang@...iatek.com>
>
> Slab OOB issue is scanned by KASAN in cpu_power_to_freq().
> If power is limited below the power of OPP0 in EM table,
> it will cause slab out-of-bound issue with negative array
> index.
>
> Return the lowest frequency if limited power cannot found
> a suitable OPP in EM table to fix this issue.
>
> Backtrace:
> [<ffffffd02d2a37f0>] die+0x104/0x5ac
> [<ffffffd02d2a5630>] bug_handler+0x64/0xd0
> [<ffffffd02d288ce4>] brk_handler+0x160/0x258
> [<ffffffd02d281e5c>] do_debug_exception+0x248/0x3f0
> [<ffffffd02d284488>] el1_dbg+0x14/0xbc
> [<ffffffd02d75d1d4>] __kasan_report+0x1dc/0x1e0
> [<ffffffd02d75c2e0>] kasan_report+0x10/0x20
> [<ffffffd02d75def8>] __asan_report_load8_noabort+0x18/0x28
> [<ffffffd02e6fce5c>] cpufreq_power2state+0x180/0x43c
> [<ffffffd02e6ead80>] power_actor_set_power+0x114/0x1d4
> [<ffffffd02e6fac24>] allocate_power+0xaec/0xde0
> [<ffffffd02e6f9f80>] power_allocator_throttle+0x3ec/0x5a4
> [<ffffffd02e6ea888>] handle_thermal_trip+0x160/0x294
> [<ffffffd02e6edd08>] thermal_zone_device_check+0xe4/0x154
> [<ffffffd02d351cb4>] process_one_work+0x5e4/0xe28
> [<ffffffd02d352f44>] worker_thread+0xa4c/0xfac
> [<ffffffd02d360124>] kthread+0x33c/0x358
> [<ffffffd02d289940>] ret_from_fork+0xc/0x18
>
> Fixes: 371a3bc79c11b ("thermal/drivers/cpufreq_cooling: Fix wrong frequency converted from power")
> Signed-off-by: brian-sy yang <brian-sy.yang@...iatek.com>
> Signed-off-by: Michael Kao <michael.kao@...iatek.com>
> Reviewed-by: Lukasz Luba <lukasz.luba@....com>
> ---
Applied, thanks
--
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