linux-kernel - Re: [patch -target tree] usb: gadget: f

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Date:	Thu, 10 Mar 2016 20:10:16 -0800
From:	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>
To:	Andrzej Pietrasiewicz <andrzej.p@...sung.com>
Cc:	Felipe Balbi <balbi@...nel.org>,
	Dan Carpenter <dan.carpenter@...cle.com>,
	Christoph Hellwig <hch@....de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	Bart Van Assche <bart.vanassche@...disk.com>,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	target-devel@...r.kernel.org
Subject: Re: [patch -target tree] usb: gadget: f_tcm: use after free

On Thu, 2016-03-10 at 09:34 +0100, Andrzej Pietrasiewicz wrote:
> Hi Nicholas,
> 
> W dniu 10.03.2016 o 06:19, Nicholas A. Bellinger pisze:
> > Hi Andrzej,
> >
> > On Wed, 2016-03-09 at 13:53 +0100, Andrzej Pietrasiewicz wrote:
> >> Hi Nicholas,
> >>

<SNIP>

> >
> > Mmmm, usbg_get_cmd() was missing an explicit memset() after tag lookup.
> >
> > How about the following..?
> >
> > diff --git a/drivers/usb/gadget/function/f_tcm.c b/drivers/usb/gadget/function/f_tcm.c
> > index e352a31..d4e8a91 100644
> > --- a/drivers/usb/gadget/function/f_tcm.c
> > +++ b/drivers/usb/gadget/function/f_tcm.c
> > @@ -1078,6 +1078,7 @@ static struct usbg_cmd *usbg_get_cmd(struct f_uas *fu,
> >                  return ERR_PTR(-ENOMEM);
> >
> >          cmd = &((struct usbg_cmd *)se_sess->sess_cmd_map)[tag];
> > +       memset(cmd, 0, sizeof(*cmd));
> >          cmd->se_cmd.map_tag = tag;
> >          cmd->se_cmd.tag = cmd->tag = scsi_tag;
> >          cmd->fu = fu;
> >
> >
> >
> 
> I tested it. Works for me.

Folding this missing memset() into usb-gadget's percpu_ida conversion
for -v4.

Thanks Andrzej!