linux-kernel - Re: [PATCH] ipack/carriers/tpci200: Fix a double free in tpci200_pci

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Date:   Wed, 26 May 2021 12:04:28 +0200
From:   Samuel Iglesias Gonsálvez 
        <siglesias@...lia.com>
To:     Lv Yunlong <lyl2019@...l.ustc.edu.cn>, jens.taprogge@...rogge.org,
        gregkh@...uxfoundation.org
Cc:     industrypack-devel@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ipack/carriers/tpci200: Fix a double free in
 tpci200_pci_probe

Hi Lv,

Thanks for the patch!

Patch is,

Acked-by: Samuel Iglesias Gonsalvez <siglesias@...lia.com>

Greg, Would you mind picking this patch series through your char-misc
tree?

Thanks!

Sam

On Mon, 2021-05-24 at 02:32 -0700, Lv Yunlong wrote:
> In the out_err_bus_register error branch of tpci200_pci_probe,
> tpci200->info->cfg_regs is freed by tpci200_uninstall()->
> tpci200_unregister()->pci_iounmap(..,tpci200->info->cfg_regs)
> in the first time.
> 
> But later, iounmap() is called to free tpci200->info->cfg_regs
> again.
> 
> My patch sets tpci200->info->cfg_regs to NULL after
> tpci200_uninstall()
> to avoid the double free.
> 
> Fixes: cea2f7cdff2af ("Staging: ipack/bridges/tpci200: Use the
> TPCI200 in big endian mode")
> Signed-off-by: Lv Yunlong <lyl2019@...l.ustc.edu.cn>
> ---
>  drivers/ipack/carriers/tpci200.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/ipack/carriers/tpci200.c
> b/drivers/ipack/carriers/tpci200.c
> index ec71063fff76..e1822e87ec3d 100644
> --- a/drivers/ipack/carriers/tpci200.c
> +++ b/drivers/ipack/carriers/tpci200.c
> @@ -596,8 +596,11 @@ static int tpci200_pci_probe(struct pci_dev
> *pdev,
>  
>  out_err_bus_register:
>         tpci200_uninstall(tpci200);
> +       /* tpci200->info->cfg_regs is unmapped in tpci200_uninstall
> */
> +       tpci200->info->cfg_regs = NULL;
>  out_err_install:
> -       iounmap(tpci200->info->cfg_regs);
> +       if (tpci200->info->cfg_regs)
> +               iounmap(tpci200->info->cfg_regs);
>  out_err_ioremap:
>         pci_release_region(pdev, TPCI200_CFG_MEM_BAR);
>  out_err_pci_request:


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