linux-kernel - Re: [PATCH] net: atlantic: fix potential memory leak in aq_ndev

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Date:   Fri, 1 Jul 2022 16:33:28 +0200
From:   Francois Romieu <romieu@...zoreil.com>
To:     Jianglei Nie <niejianglei2021@....com>
Cc:     irusskikh@...vell.com, davem@...emloft.net, edumazet@...gle.com,
        kuba@...nel.org, pabeni@...hat.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: atlantic: fix potential memory leak in
 aq_ndev_close()

Jianglei Nie <niejianglei2021@....com> :
> If aq_nic_stop() fails, aq_ndev_close() returns err without calling
> aq_nic_deinit() to release the relevant memory and resource, which
> will lead to a memory leak.
> 
> We can fix it by deleting the if condition judgment and goto statement to
> call aq_nic_deinit() directly after aq_nic_stop() to fix the memory leak.
> 
> Signed-off-by: Jianglei Nie <niejianglei2021@....com>

Either (1) the hardware is stopped and the relevance of error returning
aq_nic_stop is dubious at best or (2) the hardware is not stopped and
it may not be safe to remove its kernel allocated resources behind its
back.

There is a problem but this patch is imho targeting the symptom.

A knowledgeable answer to (1), (2) could also help to avoid the
dev_{close/open} danse in drivers/net/ethernet/aquantia/atlantic/aq_ethtool.c.

-- 
Ueimor