Re: [PATCH 3/3] usb: gadget: f_midi: check for error on usb_ep_queue

Felipe Tonello
2015-09-18T17:33:01Z

On Fri, Sep 18, 2015 at 6:30 PM, <eu@felipetonello.com> wrote:
> From: "Felipe F. Tonello" <eu@felipetonello.com>
>
> f_midi is not checking weather the is an error on usb_ep_queue
> request, ignoring potential problems, such as memory leaks.
>
> Signed-off-by: Felipe F. Tonello <eu@felipetonello.com>
> ---
>
> Changes for v2:
> - Update code style.
>
> drivers/usb/gadget/function/f_midi.c | 12 +++++++++---
> 1 file changed, 9 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/usb/gadget/function/f_midi.c b/drivers/usb/gadget/function/f_midi.c
> index ad50a67..c04133422 100644
> --- a/drivers/usb/gadget/function/f_midi.c
> +++ b/drivers/usb/gadget/function/f_midi.c
> @@ -543,10 +543,16 @@ static void f_midi_transmit(struct f_midi *midi, struct usb_request *req)
> }
> }
>
> - if (req->length > 0)
> - usb_ep_queue(ep, req, GFP_ATOMIC);
> - else
> + if (req->length > 0) {
> + int err;
> +
> + err = usb_ep_queue(ep, req, GFP_ATOMIC);
> + if (err < 0)
> + ERROR(midi, "%s queue req: %d\n",
> + midi->out_ep->name, err);

I just realised there is a problem here. It is in_ep in this case. I
will fix it in v3.

> + } else {
> free_ep_req(ep, req);
> + }
> }
>
> static void f_midi_in_tasklet(unsigned long data)
> --
> 2.1.4
>