Re: [PATCH] scsi: lpfc: Fix lpfc_nodelist leak when processing unsolicited event

[James Smart <james.smart@broadcom.com>]

On 5/25/2020 8:12 AM, Daniel Wagner wrote:
> Hi,
>
> On Mon, May 25, 2020 at 10:16:24PM +0800, Xiyu Yang wrote:
>> In order to create or activate a new node, lpfc_els_unsol_buffer()
>> invokes lpfc_nlp_init() or lpfc_enable_node() or lpfc_nlp_get(), all of
>> them will return a reference of the specified lpfc_nodelist object to
>> "ndlp" with increased refcnt.
> lpfc_enable_node() is not changing the refcnt.
>
>> When lpfc_els_unsol_buffer() returns, local variable "ndlp" becomes
>> invalid, so the refcount should be decreased to keep refcount balanced.
>>
>> The reference counting issue happens in one exception handling path of
>> lpfc_els_unsol_buffer(). When "ndlp" in DEV_LOSS, the function forgets
>> to decrease the refcnt increased by lpfc_nlp_init() or
>> lpfc_enable_node() or lpfc_nlp_get(), causing a refcnt leak.
>>
>> Fix this issue by calling lpfc_nlp_put() when "ndlp" in DEV_LOSS.
> This sounds reasonable. At least the lpfc_nlp_init() and lpfc_nlp_get() case
> needs this. And I suppose this is also ok for the lfpc_enable_node().
>
> Reviewed-by: Daniel Wagner <dwagner@suse.de>
>
> Thanks,
> Daniel

Looked at it here and it looks good.

Reviewed-by: James Smart <james.smart@broadcom.com>

-- james