linux-kernel - Re: [PATCH] power: supply: max17040: fix null-ptr-deref in max17040

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Date:   Tue, 12 Oct 2021 17:29:44 +0200
From:   Sebastian Reichel <sebastian.reichel@...labora.com>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
Cc:     Yang Yingliang <yangyingliang@...wei.com>,
        linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
        iskren.chernev@...il.com
Subject: Re: [PATCH] power: supply: max17040: fix null-ptr-deref in
 max17040_probe()

Hi,

On Sat, Oct 09, 2021 at 07:18:30PM +0200, Krzysztof Kozlowski wrote:
> On 08/10/2021 08:31, Yang Yingliang wrote:
> > Add check the return value of devm_regmap_init_i2c(), otherwise
> > later access may cause null-ptr-deref as follows:
> > 
> > KASAN: null-ptr-deref in range [0x0000000000000360-0x0000000000000367]
> > RIP: 0010:regmap_read+0x33/0x170
> > Call Trace:
> >   max17040_probe+0x61b/0xff0 [max17040_battery]
> >  ? write_comp_data+0x2a/0x90
> >  ? max17040_set_property+0x1d0/0x1d0 [max17040_battery]
> >  ? tracer_hardirqs_on+0x33/0x520
> >  ? __sanitizer_cov_trace_pc+0x1d/0x50
> >  ? _raw_spin_unlock_irqrestore+0x4b/0x60
> >  ? trace_hardirqs_on+0x63/0x2d0
> >  ? write_comp_data+0x2a/0x90
> >  ? __sanitizer_cov_trace_pc+0x1d/0x50
> >  ? max17040_set_property+0x1d0/0x1d0 [max17040_battery]
> >  i2c_device_probe+0xa31/0xbe0
> > 
> > Fixes: 6455a8a84bdf ("power: supply: max17040: Use regmap i2c")
> > Reported-by: Hulk Robot <hulkci@...wei.com>
> > Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
> > ---
> >  drivers/power/supply/max17040_battery.c | 2 ++
> >  1 file changed, 2 insertions(+)
> 
> 
> Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>

Thanks, queued.

-- Sebastian

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