linux-kernel - Re: [PATCH] thermal: core: fix memory leak in __thermal_cooling_device

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Date:   Mon, 16 May 2022 14:48:16 +0200
From:   Daniel Lezcano <daniel.lezcano@...aro.org>
To:     Yang Yingliang <yangyingliang@...wei.com>,
        linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org
Cc:     rafael@...nel.org, amitk@...nel.org, rui.zhang@...el.com
Subject: Re: [PATCH] thermal: core: fix memory leak in
 __thermal_cooling_device_register()

On 11/05/2022 04:06, Yang Yingliang wrote:
> I got memory leak as follows when doing fault injection test:
> 
> unreferenced object 0xffff888010080000 (size 264312):
>    comm "182", pid 102533, jiffies 4296434960 (age 10.100s)
>    hex dump (first 32 bytes):
>      00 00 00 00 ad 4e ad de ff ff ff ff 00 00 00 00  .....N..........
>      ff ff ff ff ff ff ff ff 40 7f 1f b9 ff ff ff ff  ........@.......
>    backtrace:
>      [<0000000038b2f4fc>] kmalloc_order_trace+0x1d/0x110 mm/slab_common.c:969
>      [<00000000ebcb8da5>] __kmalloc+0x373/0x420 include/linux/slab.h:510
>      [<0000000084137f13>] thermal_cooling_device_setup_sysfs+0x15d/0x2d0 include/linux/slab.h:586
>      [<00000000352b8755>] __thermal_cooling_device_register+0x332/0xa60 drivers/thermal/thermal_core.c:927
>      [<00000000fb9f331b>] devm_thermal_of_cooling_device_register+0x6b/0xf0 drivers/thermal/thermal_core.c:1041
>      [<000000009b8012d2>] max6650_probe.cold+0x557/0x6aa drivers/hwmon/max6650.c:211
>      [<00000000da0b7e04>] i2c_device_probe+0x472/0xac0 drivers/i2c/i2c-core-base.c:561
> 
> If device_register() fails, thermal_cooling_device_destroy_sysfs() need be called
> to free the memory allocated in thermal_cooling_device_setup_sysfs().
> 
> Fixes: 8ea229511e06 ("thermal: Add cooling device's statistics in sysfs")
> Reported-by: Hulk Robot <hulkci@...wei.com>
> Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
> ---
>   drivers/thermal/thermal_core.c | 1 +
>   1 file changed, 1 insertion(+)

Applied, thanks


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