linux-kernel - Re: [PATCH v4 4/7] usb: gadget: f_midi: fix leak on failed to enqueue out requests

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Date:	Mon, 26 Oct 2015 22:55:05 +0000
From:	Felipe Tonello <eu@...ipetonello.com>
To:	Robert Baldyga <r.baldyga@...kerion.com>
Cc:	USB list <linux-usb@...r.kernel.org>,
	Kernel development list <linux-kernel@...r.kernel.org>,
	Felipe Balbi <balbi@...com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Andrzej Pietrasiewicz <andrzej.p@...sung.com>,
	Clemens Ladisch <clemens@...isch.de>
Subject: Re: [PATCH v4 4/7] usb: gadget: f_midi: fix leak on failed to enqueue
 out requests

Hi Robert,

On Mon, Oct 26, 2015 at 10:23 PM, Robert Baldyga
<r.baldyga@...kerion.com> wrote:
> On 10/26/2015 05:55 PM, Felipe F. Tonello wrote:
>> This patch fixes a memory leak that occurs when an endpoint fails to enqueue
>> the request. If that happens the complete function will never be called, thus
>> never freeing the request.
>>
>> Signed-off-by: Felipe F. Tonello <eu@...ipetonello.com>
>> ---
>>  drivers/usb/gadget/function/f_midi.c | 1 +
>>  1 file changed, 1 insertion(+)
>>
>> diff --git a/drivers/usb/gadget/function/f_midi.c b/drivers/usb/gadget/function/f_midi.c
>> index 4c01c8a..0e9cdeb 100644
>> --- a/drivers/usb/gadget/function/f_midi.c
>> +++ b/drivers/usb/gadget/function/f_midi.c
>> @@ -344,6 +344,7 @@ static int f_midi_set_alt(struct usb_function *f, unsigned intf, unsigned alt)
>>               if (err) {
>>                       ERROR(midi, "%s queue req: %d\n",
>>                                   midi->out_ep->name, err);
>> +                     free_ep_req(midi->out_ep, req);
>>               }
>>       }
>>
>>
>
> Don't we have similar problem in f_midi_transmit() and f_midi_complete()
> functions?

Yes and it is been addressed on Patch 7.

Felipe
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