linux-kernel - Re: [PATCH V2 3/4] PCI: endpoint: Delete list entry before freeing

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Message-ID: <20221101124303.GM54667@thinkpad>
Date:   Tue, 1 Nov 2022 18:13:03 +0530
From:   Manivannan Sadhasivam <mani@...nel.org>
To:     Vidya Sagar <vidyas@...dia.com>
Cc:     jingoohan1@...il.com, gustavo.pimentel@...opsys.com,
        lpieralisi@...nel.org, robh@...nel.org, kw@...ux.com,
        bhelgaas@...gle.com, kishon@...com, thierry.reding@...il.com,
        jonathanh@...dia.com, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org, kthota@...dia.com,
        mmaddireddy@...dia.com, sagar.tv@...il.com
Subject: Re: [PATCH V2 3/4] PCI: endpoint: Delete list entry before freeing

On Thu, Oct 13, 2022 at 11:48:14PM +0530, Vidya Sagar wrote:
> Currently, epf_group list is traversed, and each group entry is freed and
> epf_group list head is deleted in the end. Deleting the list head is
> corrupting the data in the group entries that are already freed, leading to
> random crashes. To fix this issue, delete each group entry and then free
> it, and don't delete epf_group list head.
> 
> Signed-off-by: Vidya Sagar <vidyas@...dia.com>

Reviewed-by: Manivannan Sadhasivam <mani@...nel.org>

Thanks,
Mani

> ---
> V2:
> * Reworded the commit message
> 
>  drivers/pci/endpoint/pci-epf-core.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/pci/endpoint/pci-epf-core.c b/drivers/pci/endpoint/pci-epf-core.c
> index 9ed556936f48..a7f4ae33905d 100644
> --- a/drivers/pci/endpoint/pci-epf-core.c
> +++ b/drivers/pci/endpoint/pci-epf-core.c
> @@ -340,9 +340,10 @@ static void pci_epf_remove_cfs(struct pci_epf_driver *driver)
>  		return;
>  
>  	mutex_lock(&pci_epf_mutex);
> -	list_for_each_entry_safe(group, tmp, &driver->epf_group, group_entry)
> +	list_for_each_entry_safe(group, tmp, &driver->epf_group, group_entry) {
> +		list_del(&group->group_entry);
>  		pci_ep_cfs_remove_epf_group(group);
> -	list_del(&driver->epf_group);
> +	}
>  	mutex_unlock(&pci_epf_mutex);
>  }
>  
> -- 
> 2.17.1
> 

-- 
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