linux-kernel - Re: [PATCH] reset: Fix memory leak in reset_control_array

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Date:   Tue, 22 Oct 2019 15:45:58 +0530
From:   Kishon Vijay Abraham I <kishon@...com>
To:     Philipp Zabel <p.zabel@...gutronix.de>
CC:     <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] reset: Fix memory leak in reset_control_array_put()



On 22/10/19 2:30 PM, Philipp Zabel wrote:
> Hi Kishon,
> 
> On Tue, 2019-10-22 at 14:06 +0530, Kishon Vijay Abraham I wrote:
>> Memory allocated for 'struct reset_control_array' in
>> of_reset_control_array_get() is never freed in
>> reset_control_array_put() resulting in kmemleak showing
>> the following backtrace.
>>
>>   backtrace:
>>     [<00000000c5f17595>] __kmalloc+0x1b0/0x2b0
>>     [<00000000bd499e13>] of_reset_control_array_get+0xa4/0x180
>>     [<000000004cc02754>] 0xffff800008c669e4
>>     [<0000000050a83b24>] platform_drv_probe+0x50/0xa0
>>     [<00000000d3a0b0bc>] really_probe+0x108/0x348
>>     [<000000005aa458ac>] driver_probe_device+0x58/0x100
>>     [<000000008853626c>] device_driver_attach+0x6c/0x90
>>     [<0000000085308d19>] __driver_attach+0x84/0xc8
>>     [<00000000080d35f2>] bus_for_each_dev+0x74/0xc8
>>     [<00000000dd7f015b>] driver_attach+0x20/0x28
>>     [<00000000923ba6e6>] bus_add_driver+0x148/0x1f0
>>     [<0000000061473b66>] driver_register+0x60/0x110
>>     [<00000000c5bec167>] __platform_driver_register+0x40/0x48
>>     [<000000007c764b4f>] 0xffff800008c6c020
>>     [<0000000047ec2e8c>] do_one_initcall+0x5c/0x1b0
>>     [<0000000093d4b50d>] do_init_module+0x54/0x1d0
>>
>> Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
>> ---
>>  drivers/reset/core.c | 1 +
>>  1 file changed, 1 insertion(+)
>>
>> diff --git a/drivers/reset/core.c b/drivers/reset/core.c
>> index 213ff40dda11..36b1ff69b1e2 100644
>> --- a/drivers/reset/core.c
>> +++ b/drivers/reset/core.c
>> @@ -748,6 +748,7 @@ static void reset_control_array_put(struct reset_control_array *resets)
>>  	for (i = 0; i < resets->num_rstcs; i++)
>>  		__reset_control_put_internal(resets->rstc[i]);
>>  	mutex_unlock(&reset_list_mutex);
>> +	kfree(resets);
>>  }
>>  
>>  /**
> 
> Thank you for the patch! I've added a
> 
> Fixes: 17c82e206d2a ("reset: Add APIs to manage array of resets")
> 
> tag and applied it to my reset/fixes branch.

That was quick! Thanks!

-Kishon