linux-kernel - Re: [PATCH] epic100: fix use after free on rmmod

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Message-ID: <YrQw1CVJfIS18CNo@electric-eye.fr.zoreil.com>
Date:   Thu, 23 Jun 2022 11:22:28 +0200
From:   Francois Romieu <romieu@...zoreil.com>
To:     Tong Zhang <ztong0001@...il.com>
Cc:     "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Arnd Bergmann <arnd@...db.de>, Jason Gunthorpe <jgg@...pe.ca>,
        Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Yilun Wu <yiluwu@...stonybrook.edu>
Subject: Re: [PATCH] epic100: fix use after free on rmmod

Tong Zhang <ztong0001@...il.com> :
> epic_close() calls epic_rx() and uses dma buffer, but in epic_remove_one()
> we already freed the dma buffer. To fix this issue, reorder function calls
> like in the .probe function.
> 
> BUG: KASAN: use-after-free in epic_rx+0xa6/0x7e0 [epic100]
> Call Trace:
>  epic_rx+0xa6/0x7e0 [epic100]
>  epic_close+0xec/0x2f0 [epic100]
>  unregister_netdev+0x18/0x20
>  epic_remove_one+0xaa/0xf0 [epic100]
> 
> Fixes: ae150435b59e ("smsc: Move the SMC (SMSC) drivers")
> Reported-by: Yilun Wu <yiluwu@...stonybrook.edu>
> Signed-off-by: Tong Zhang <ztong0001@...il.com>

The "Fixes:" tag is a bit misleading: this code path predates the move
by several years. Ignoring pci_* vs dma_* API changes, this is pre-2005
material.

Reviewed-by: Francois Romieu <romieu@...zoreil.com>

-- 
Ueimor