linux-kernel - Re: [PATCH -next,v4] nvmem: core: Fix memleak in nvmem

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Message-ID: <be2bffa9-7331-9d96-e7a0-94561c66d00d@huawei.com>
Date:   Mon, 18 Jul 2022 20:43:08 +0800
From:   cuigaosheng <cuigaosheng1@...wei.com>
To:     Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        <gregkh@...uxfoundation.org>
CC:     <linux-kernel@...r.kernel.org>, <gongruiqi1@...wei.com>,
        <wangweiyang2@...wei.com>
Subject: Re: [PATCH -next,v4] nvmem: core: Fix memleak in nvmem_register()

>
> What changed since v3?
I adjusted the commit message because the implementation of the code has 
changed.

>
> Unnecessary braces here. 
Already fixed.

Thanks,

在 2022/7/18 20:24, Srinivas Kandagatla 写道:
>
>
> On 18/07/2022 13:21, Gaosheng Cui wrote:
>> dev_set_name will alloc memory for nvmem->dev.kobj.name in
>> nvmem_register, when nvmem_validate_keepouts failed, nvmem's
>> memory will be freed and return, but nobody will free memory
>> for nvmem->dev.kobj.name, there will be memleak, so moving
>> nvmem_validate_keepouts() after device_register() and let
>> the device core deal with cleaning name in error cases.
>>
>> Fixes: de0534df9347 ("nvmem: core: fix error handling while 
>> validating keepout regions")
>> Signed-off-by: Gaosheng Cui <cuigaosheng1@...wei.com>
>> ---
>
> What changed since v3?
>
>>   drivers/nvmem/core.c | 16 +++++++---------
>>   1 file changed, 7 insertions(+), 9 deletions(-)
>>
>> diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
>> index 1e3c754efd0d..6067d3bbff5d 100644
>> --- a/drivers/nvmem/core.c
>> +++ b/drivers/nvmem/core.c
>> @@ -829,21 +829,19 @@ struct nvmem_device *nvmem_register(const 
>> struct nvmem_config *config)
>>       nvmem->dev.groups = nvmem_dev_groups;
>>   #endif
>>   -    if (nvmem->nkeepout) {
>> -        rval = nvmem_validate_keepouts(nvmem);
>> -        if (rval) {
>> -            ida_free(&nvmem_ida, nvmem->id);
>> -            kfree(nvmem);
>> -            return ERR_PTR(rval);
>> -        }
>> -    }
>> -
>>       dev_dbg(&nvmem->dev, "Registering nvmem device %s\n", 
>> config->name);
>>         rval = device_register(&nvmem->dev);
>>       if (rval)
>>           goto err_put_device;
>>   +    if (nvmem->nkeepout) {
>> +        rval = nvmem_validate_keepouts(nvmem);
>> +        if (rval) {
>
> Unnecessary braces here.
>
> --srini
>> +            goto err_device_del;
>> +        }
>> +    }
>> +
>>       if (config->compat) {
>>           rval = nvmem_sysfs_setup_compat(nvmem, config);
>>           if (rval)
> .