linux-kernel - RE: [PATCH 12/12] RDMA/mana_ib: Add a driver for Microsoft Azure Network Adapter

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Message-ID: <PH7PR21MB3263E61F0A8CA25545B47173CED09@PH7PR21MB3263.namprd21.prod.outlook.com>
Date:   Thu, 19 May 2022 17:50:07 +0000
From:   Long Li <longli@...rosoft.com>
To:     Jason Gunthorpe <jgg@...pe.ca>
CC:     KY Srinivasan <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Wei Liu <wei.liu@...nel.org>, Dexuan Cui <decui@...rosoft.com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Leon Romanovsky <leon@...nel.org>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>
Subject: RE: [PATCH 12/12] RDMA/mana_ib: Add a driver for Microsoft Azure
 Network Adapter

> Subject: Re: [PATCH 12/12] RDMA/mana_ib: Add a driver for Microsoft Azure
> Network Adapter
> 
> On Thu, May 19, 2022 at 05:57:01AM +0000, Long Li wrote:
> 
> > > > +
> > > > +	err = ib_copy_from_udata(&ucmd, udata, min(sizeof(ucmd),
> > > > +udata->inlen));
> > >
> > > Skeptical this min is correct, many other drivers get this wrong.
> >
> > I think this is correct. This is to prevent user-mode passing more data that may
> overrun the kernel buffer.
> 
> And what happens when udata->inlen is, say, 0?

Thanks. I'll add check before calling ib_copy_from_udata().

Long