linux-kernel - RE: [PATCH v1 1/5] mdev: Introduce sha1 based mdev alias

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Message-ID: <AM0PR05MB486658228E2DE7FFE4327EB8D1A20@AM0PR05MB4866.eurprd05.prod.outlook.com>
Date:   Thu, 29 Aug 2019 09:06:59 +0000
From:   Parav Pandit <parav@...lanox.com>
To:     Alex Williamson <alex.williamson@...hat.com>
CC:     Jiri Pirko <jiri@...lanox.com>,
        "kwankhede@...dia.com" <kwankhede@...dia.com>,
        "cohuck@...hat.com" <cohuck@...hat.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: [PATCH v1 1/5] mdev: Introduce sha1 based mdev alias



> -----Original Message-----
> From: Alex Williamson <alex.williamson@...hat.com>
> Sent: Thursday, August 29, 2019 2:56 AM
> To: Parav Pandit <parav@...lanox.com>
> Cc: Jiri Pirko <jiri@...lanox.com>; kwankhede@...dia.com;
> cohuck@...hat.com; davem@...emloft.net; kvm@...r.kernel.org; linux-
> kernel@...r.kernel.org; netdev@...r.kernel.org
> Subject: Re: [PATCH v1 1/5] mdev: Introduce sha1 based mdev alias
> 

> > +	/* Allocate and init descriptor */
> > +	hash_desc = kvzalloc(sizeof(*hash_desc) +
> > +			     crypto_shash_descsize(alias_hash),
> > +			     GFP_KERNEL);
> > +	if (!hash_desc)
> > +		goto desc_err;
> > +
> > +	hash_desc->tfm = alias_hash;
> > +
> > +	digest_size = crypto_shash_digestsize(alias_hash);
> > +
> > +	digest = kzalloc(digest_size, GFP_KERNEL);
> > +	if (!digest) {
> > +		ret = -ENOMEM;
> > +		goto digest_err;
> > +	}
> > +	crypto_shash_init(hash_desc);
> > +	crypto_shash_update(hash_desc, uuid, UUID_STRING_LEN);
> > +	crypto_shash_final(hash_desc, digest);
> 
> All of these can fail and many, if not most, of the callers appear that they might
> test the return value.  Thanks,
Right. Changing the signature and honoring return value in v2.

> 
> Alex