netdev - Re: [PATCH net-next v3 1/2] usbnet: ipheth: fix risk of NULL pointer deallocation

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Message-Id: <C6FF2A09-5208-4A0E-9D63-26F4CC1FE20D@gmail.com>
Date: Tue, 30 May 2023 14:09:52 +0300
From: George Valkov <gvalkov@...il.com>
To: Paolo Abeni <pabeni@...hat.com>,
 Foster Snowhill <forst@....gy>
Cc: "David S. Miller" <davem@...emloft.net>,
 Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>,
 Simon Horman <simon.horman@...igine.com>,
 Jan Kiszka <jan.kiszka@...mens.com>,
 linux-usb <linux-usb@...r.kernel.org>,
 Linux Netdev List <netdev@...r.kernel.org>
Subject: Re: [PATCH net-next v3 1/2] usbnet: ipheth: fix risk of NULL pointer
 deallocation

Thanks Paolo! Something like that?

Download attachment "0001-usbnet-ipheth-avoid-kfree-with-a-NULL-pointer.patch" of type "application/octet-stream" (1129 bytes)

Georgi Valkov
httpstorm.com
nano RTOS

> On 30 May 2023, at 2:02 PM, Paolo Abeni <pabeni@...hat.com> wrote:
> 
> Hi, 
> 
> On Sat, 2023-05-27 at 15:03 +0200, Foster Snowhill wrote:
>> From: Georgi Valkov <gvalkov@...il.com>
>> 
>> The cleanup precedure in ipheth_probe will attempt to free a
>> NULL pointer in dev->ctrl_buf if the memory allocation for
>> this buffer is not successful. While kfree ignores NULL pointers,
>> and the existing code is safe, it is a better design to rearrange
>> the goto labels and avoid this.
>> 
>> Signed-off-by: Georgi Valkov <gvalkov@...il.com>
>> Signed-off-by: Foster Snowhill <forst@....gy>
> 
> If you are going to repost (due to changes in patch 2) please update
> this patch subj, too. Currently is a bit confusing, something alike
> "cleanup the initialization error path" would be more clear.
> 
> Thanks,
> 
> Paolo
>