netdev - Re: [PATCH] net: ethernet: Fix memleak in ethoc

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Message-ID: <20201223123218.1cf7d9cb@kicinski-fedora-pc1c0hjn.dhcp.thefacebook.com>
Date:   Wed, 23 Dec 2020 12:32:18 -0800
From:   Jakub Kicinski <kuba@...nel.org>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Dinghao Liu <dinghao.liu@....edu.cn>, kjlu@....edu,
        "David S. Miller" <davem@...emloft.net>,
        Jesse Brandeburg <jesse.brandeburg@...el.com>,
        Arnd Bergmann <arnd@...db.de>, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] net: ethernet: Fix memleak in ethoc_probe

On Wed, 23 Dec 2020 16:33:04 +0100 Andrew Lunn wrote:
> On Wed, Dec 23, 2020 at 07:06:12PM +0800, Dinghao Liu wrote:
> > When mdiobus_register() fails, priv->mdio allocated
> > by mdiobus_alloc() has not been freed, which leads
> > to memleak.
> > 
> > Signed-off-by: Dinghao Liu <dinghao.liu@....edu.cn>  
> 
> Fixes: bfa49cfc5262 ("net/ethoc: fix null dereference on error exit path")
> 
> Reviewed-by: Andrew Lunn <andrew@...n.ch>

Ooof, I applied without looking at your email and I added:

Fixes: e7f4dc3536a4 ("mdio: Move allocation of interrupts into core")

I believe this is the correct Fixes tag. Before the exit patch was
freeing both MDIO and the IRQ depending on the fact that kfree(NULL) 
is fine. Am I wrong? Not that we can fix it now :)