linux-kernel - Re: [PATCH v2] cpufreq:fix memory leak in sun50i_cpufreq_nvmem

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Date:   Sat, 23 Apr 2022 21:46:00 -0500
From:   Samuel Holland <samuel@...lland.org>
To:     Xiaobing Luo <luoxiaobing0926@...il.com>, tiny.windzz@...il.com,
        rafael@...nel.org, viresh.kumar@...aro.org, wens@...e.org,
        jernej.skrabec@...il.com, mripard@...nel.org
Cc:     linux-pm@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-sunxi@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] cpufreq:fix memory leak in sun50i_cpufreq_nvmem_probe

On 4/23/22 10:12 AM, Xiaobing Luo wrote:
> --------------------------------------------
> unreferenced object 0xffff000010742a00 (size 128):
>   comm "swapper/0", pid 1, jiffies 4294902015 (age 1187.652s)
>   hex dump (first 32 bytes):
>     00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
>     00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
>   backtrace:
>     [<00000000b4dfebaa>] __kmalloc+0x338/0x474
>     [<00000000d6e716db>] sun50i_cpufreq_nvmem_probe+0xc4/0x36c
>     [<000000007d6082a0>] platform_probe+0x98/0x11c
>     [<00000000c990f549>] really_probe+0x234/0x5a0
>     [<000000002d9fecc6>] __driver_probe_device+0x194/0x224
>     [<00000000cf0b94fa>] driver_probe_device+0x64/0x13c
>     [<00000000f238e4cf>] __device_attach_driver+0xf8/0x180
>     [<000000006720e418>] bus_for_each_drv+0xf8/0x160
>     [<00000000df4f14f6>] __device_attach+0x174/0x29c
>     [<00000000782002fb>] device_initial_probe+0x20/0x30
>     [<00000000c2681b06>] bus_probe_device+0xfc/0x110
>     [<00000000964cf3bd>] device_add+0x5f0/0xcd0
>     [<000000004b9264e3>] platform_device_add+0x198/0x390
>     [<00000000fa82a9d0>] platform_device_register_full+0x178/0x210
>     [<000000009a5daf13>] sun50i_cpufreq_init+0xf8/0x168
>     [<000000000377cc7c>] do_one_initcall+0xe4/0x570
> --------------------------------------------
> 
> if sun50i_cpufreq_get_efuse failed, then opp_tables leak.
> Fixes: f328584f7bff ("cpufreq: Add sun50i nvmem based CPU scaling driver")
> 
> Signed-off-by: Xiaobing Luo <luoxiaobing0926@...il.com>

Two minor style issues: there should be a space after "cpufreq:" in the commit
subject. And the blank line should come before the "Fixes:" tag, not after.
Otherwise:

Reviewed-by: Samuel Holland <samuel@...lland.org>

> ---
>  drivers/cpufreq/sun50i-cpufreq-nvmem.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/cpufreq/sun50i-cpufreq-nvmem.c b/drivers/cpufreq/sun50i-cpufreq-nvmem.c
> index 2deed8d8773f..75e1bf3a08f7 100644
> --- a/drivers/cpufreq/sun50i-cpufreq-nvmem.c
> +++ b/drivers/cpufreq/sun50i-cpufreq-nvmem.c
> @@ -98,8 +98,10 @@ static int sun50i_cpufreq_nvmem_probe(struct platform_device *pdev)
>  		return -ENOMEM;
>  
>  	ret = sun50i_cpufreq_get_efuse(&speed);
> -	if (ret)
> +	if (ret) {
> +		kfree(opp_tables);
>  		return ret;
> +	}
>  
>  	snprintf(name, MAX_NAME_LEN, "speed%d", speed);
>  
>