linux-kernel - Re: [PATCH] PCI: endpoint: Fix use after free in pci_epf_remove

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Date:   Mon, 21 Jun 2021 10:39:48 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Shunsuke Mie <mie@...l.co.jp>
Cc:     kishon@...com, lorenzo.pieralisi@....com, bhelgaas@...gle.com,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org
Subject: Re: [PATCH] PCI: endpoint: Fix use after free in pci_epf_remove_cfs()

On Mon, Jun 21, 2021 at 04:00:58PM +0900, Shunsuke Mie wrote:
> All of entries are freed in a loop, however, the freed entry is accessed
> by list_del() after the loop.
> 
> When epf driver that includes pci-epf-test unload, the pci_epf_remove_cfs()
> is called, and occurred the use after free. Therefore, kernel panics
> randomly after or while the module unloading.
> 
> I tested this patch with r8a77951-Salvator-xs boards.
> 
> Fixes: ef1433f ("PCI: endpoint: Create configfs entry for each pci_epf_device_id table entry")
> Signed-off-by: Shunsuke Mie <mie@...l.co.jp>
> ---
>  drivers/pci/endpoint/pci-epf-core.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)

<formletter>

This is not the correct way to submit patches for inclusion in the
stable kernel tree.  Please read:
    https://www.kernel.org/doc/html/latest/process/stable-kernel-rules.html
for how to do this properly.

</formletter>