linux-kernel - Re: crypto: algif_hash: creating 0 sized array in hash

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Message-ID: <56A7831E.5020208@oracle.com>
Date:	Tue, 26 Jan 2016 09:30:54 -0500
From:	Sasha Levin <sasha.levin@...cle.com>
To:	Herbert Xu <herbert@...dor.apana.org.au>
Cc:	"David S. Miller" <davem@...emloft.net>,
	"open list:CRYPTO API" <linux-crypto@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: crypto: algif_hash: creating 0 sized array in hash_accept

On 01/26/2016 09:07 AM, Herbert Xu wrote:
> On Tue, Jan 26, 2016 at 08:26:41AM -0500, Sasha Levin wrote:
>> >
>> > This seems to be happening with "digest_null".
> In that case this is expected as digest_null obviously has no
> state.  So why is a zero-length array disallowed by ubsan?

The C spec forbids it, so ubsan complains :)


Thanks,
Sasha