linux-kernel - Re: [PATCH -next] staging: rtl8192e: rtllib_module: fix missing free_netdev() on error in alloc

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Message-ID: <851b57b9-79ac-e7a1-a61a-6f36a5d9d77a@gmail.com>
Date:   Tue, 30 Nov 2021 21:57:23 +0300
From:   Pavel Skripkin <paskripkin@...il.com>
To:     Yang Yingliang <yangyingliang@...wei.com>,
        linux-kernel@...r.kernel.org, linux-staging@...ts.linux.dev
Cc:     gregkh@...uxfoundation.org
Subject: Re: [PATCH -next] staging: rtl8192e: rtllib_module: fix missing
 free_netdev() on error in alloc_rtllib()

On 11/30/21 06:40, Yang Yingliang wrote:
> Add the missing free_netdev() before return from alloc_rtllib()
> in the error handling case.
> 
> Signed-off-by: Yang Yingliang <yangyingliang@...wei.com>
> ---
>   drivers/staging/rtl8192e/rtllib_module.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/staging/rtl8192e/rtllib_module.c b/drivers/staging/rtl8192e/rtllib_module.c
> index 64d9feee1f39..18d898714c5c 100644
> --- a/drivers/staging/rtl8192e/rtllib_module.c
> +++ b/drivers/staging/rtl8192e/rtllib_module.c
> @@ -125,7 +125,7 @@ struct net_device *alloc_rtllib(int sizeof_priv)
>   
>   	ieee->pHTInfo = kzalloc(sizeof(struct rt_hi_throughput), GFP_KERNEL);
>   	if (!ieee->pHTInfo)
> -		return NULL;
> +		goto failed;
>   
>   	HTUpdateDefaultSetting(ieee);
>   	HTInitializeHTInfo(ieee);
> 

Good catch!

There are 2 more possible leaks, tho. rtllib_networks_allocate() and 
rtllib_softmac_init() should be unwinded too.

For some odd reason rtllib_softmac_init() does not return an error in 
case of allocation failure, but it should be fixed. I think, it worth to 
fix whole error handling in one patch




With regards,
Pavel Skripkin