From: Herbert Xu <herbert@gondor.apana.org.au>
To: Eric Biggers <ebiggers@kernel.org>
Cc: syzbot <syzbot+fc0674cde00b66844470@syzkaller.appspotmail.com>,
davem@davemloft.net, linux-crypto@vger.kernel.org,
linux-kernel@vger.kernel.org, netdev@vger.kernel.org,
syzkaller-bugs@googlegroups.com
Subject: Re: crypto: api - Fix use-after-free and race in crypto_spawn_alg
Date: Thu, 16 Apr 2020 12:42:16 +1000 [thread overview]
Message-ID: <20200416024216.GA18571@gondor.apana.org.au> (raw)
In-Reply-To: <20200416023001.GE816@sol.localdomain>
On Wed, Apr 15, 2020 at 07:30:01PM -0700, Eric Biggers wrote:
>
> I'm not sure what you mean here. crypto_alg_get() is:
>
> static inline struct crypto_alg *crypto_alg_get(struct crypto_alg *alg)
> {
> refcount_inc(&alg->cra_refcnt);
> return alg;
> }
>
> So given:
>
> target = crypto_alg_get(alg);
>
> Both alg and target have to be non-NULL.
Yes I know that we know that it can't be NULL, but gcc 8.3 doesn't.
Cheers,
--
Email: Herbert Xu <herbert@gondor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
next prev parent reply other threads:[~2020-04-16 2:42 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-06 18:16 WARNING: refcount bug in crypto_destroy_tfm syzbot
2020-04-10 6:09 ` crypto: api - Fix use-after-free and race in crypto_spawn_alg Herbert Xu
2020-04-16 2:17 ` Eric Biggers
2020-04-16 2:25 ` Herbert Xu
2020-04-16 2:30 ` Eric Biggers
2020-04-16 2:42 ` Herbert Xu [this message]
2020-04-10 9:18 Markus Elfring
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