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

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Date:   Mon, 18 Jul 2022 13:24:48 +0100
From:   Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To:     Gaosheng Cui <cuigaosheng1@...wei.com>, 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()



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)