linux-kernel - Re: [PATCH] crypto: pcrypt - fix freeing pcrypt instances

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Message-ID: <20171222083635.GA30861@gondor.apana.org.au>
Date:   Fri, 22 Dec 2017 19:36:36 +1100
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Eric Biggers <ebiggers3@...il.com>
Cc:     linux-crypto@...r.kernel.org,
        Steffen Klassert <steffen.klassert@...unet.com>,
        "David S . Miller" <davem@...emloft.net>,
        linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com,
        Eric Biggers <ebiggers@...gle.com>, stable@...r.kernel.org
Subject: Re: [PATCH] crypto: pcrypt - fix freeing pcrypt instances

On Wed, Dec 20, 2017 at 02:28:25PM -0800, Eric Biggers wrote:
> From: Eric Biggers <ebiggers@...gle.com>
> 
> pcrypt is using the old way of freeing instances, where the ->free()
> method specified in the 'struct crypto_template' is passed a pointer to
> the 'struct crypto_instance'.  But the crypto_instance is being
> kfree()'d directly, which is incorrect because the memory was actually
> allocated as an aead_instance, which contains the crypto_instance at a
> nonzero offset.  Thus, the wrong pointer was being kfree()'d.
> 
> Fix it by switching to the new way to free aead_instance's where the
> ->free() method is specified in the aead_instance itself.
> 
> Reported-by: syzbot <syzkaller@...glegroups.com>
> Fixes: 0496f56065e0 ("crypto: pcrypt - Add support for new AEAD interface")
> Cc: <stable@...r.kernel.org> # v4.2+
> Signed-off-by: Eric Biggers <ebiggers@...gle.com>

Patch applied.  Thanks.
-- 
Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt