linux-kernel - Re: [PATCH] crypto: atmel-aes - Fix IV handling when req->nbytes

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Date:   Thu, 10 Oct 2019 23:56:43 +1100
From:   Herbert Xu <herbert@...dor.apana.org.au>
To:     Tudor.Ambarus@...rochip.com
Cc:     Nicolas.Ferre@...rochip.com, alexandre.belloni@...tlin.com,
        Ludovic.Desroches@...rochip.com, linux-crypto@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] crypto: atmel-aes - Fix IV handling when req->nbytes <
 ivsize

On Fri, Oct 04, 2019 at 08:55:37AM +0000, Tudor.Ambarus@...rochip.com wrote:
> From: Tudor Ambarus <tudor.ambarus@...rochip.com>
> 
> commit 394a9e044702 ("crypto: cfb - add missing 'chunksize' property")
> adds a test vector where the input length is smaller than the IV length
> (the second test vector). This revealed a NULL pointer dereference in
> the atmel-aes driver, that is caused by passing an incorrect offset in
> scatterwalk_map_and_copy() when atmel_aes_complete() is called.
> 
> Do not save the IV in req->info of ablkcipher_request (or equivalently
> req->iv of skcipher_request) when req->nbytes < ivsize, because the IV
> will not be further used.
> 
> While touching the code, modify the type of ivsize from int to
> unsigned int, to comply with the return type of
> crypto_ablkcipher_ivsize().
> 
> Fixes: 91308019ecb4 ("crypto: atmel-aes - properly set IV after {en,de}crypt")
> Signed-off-by: Tudor Ambarus <tudor.ambarus@...rochip.com>
> ---
>  drivers/crypto/atmel-aes.c | 53 ++++++++++++++++++++++++++--------------------
>  1 file changed, 30 insertions(+), 23 deletions(-)

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