Re: [PATCH] PCI: endpoint: use after free in pci_epf_unregister_driver()

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On Friday 29 June 2018 03:30 PM, Lorenzo Pieralisi wrote:
> On Thu, May 31, 2018 at 09:21:48AM +0300, Dan Carpenter wrote:
>> We need to use list_for_each_entry_safe() because the
>> pci_ep_cfs_remove_epf_group() function frees "group".
>>
>> Fixes: ef1433f717a2 ("PCI: endpoint: Create configfs entry for each pci_epf_device_id table entry")
>> Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
>>
>> diff --git a/drivers/pci/endpoint/pci-epf-core.c b/drivers/pci/endpoint/pci-epf-core.c
>> index 523a8cab3bfb..bf53fad636a5 100644
>> --- a/drivers/pci/endpoint/pci-epf-core.c
>> +++ b/drivers/pci/endpoint/pci-epf-core.c
>> @@ -145,10 +145,10 @@ EXPORT_SYMBOL_GPL(pci_epf_alloc_space);
>>   */
>>  void pci_epf_unregister_driver(struct pci_epf_driver *driver)
>>  {
>> -	struct config_group *group;
>> +	struct config_group *group, *tmp;
>>  
>>  	mutex_lock(&pci_epf_mutex);
>> -	list_for_each_entry(group, &driver->epf_group, group_entry)
>> +	list_for_each_entry_safe(group, tmp, &driver->epf_group, group_entry)
>>  		pci_ep_cfs_remove_epf_group(group);
>>  	list_del(&driver->epf_group);
>>  	mutex_unlock(&pci_epf_mutex);
> 
> Kishon, I need your ACK to merge this fix, thanks.

Looks correct to me.
Acked-by: Kishon Vijay Abraham I <kishon@xxxxxx>
> 
> Lorenzo
> 



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