On Thu, Nov 23, 2017 at 01:49:06PM +0100, Ondrej Mosnacek wrote:
> The skcipher_walk_aead_common function calls scatterwalk_copychunks on
> the input and output walks to skip the associated data. If the AD end
> at an SG list entry boundary, then after these calls the walks will
> still be pointing to the end of the skipped region.
>
> These offsets are later checked for alignment in skcipher_walk_next,
> so the skcipher_walk may detect the alignment incorrectly.
>
> This patch fixes it by calling scatterwalk_done after the copychunks
> calls to ensure that the offsets refer to the right SG list entry.
>
> Fixes: b286d8b1a690 ("crypto: skcipher - Add skcipher walk interface")
> Cc: <stable@xxxxxxxxxxxxxxx>
> Signed-off-by: Ondrej Mosnacek <omosnacek@xxxxxxxxx>
Good catch!
> diff --git a/crypto/skcipher.c b/crypto/skcipher.c
> index 4faa0fd53b0c..6c45ed536664 100644
> --- a/crypto/skcipher.c
> +++ b/crypto/skcipher.c
> @@ -517,6 +517,9 @@ static int skcipher_walk_aead_common(struct skcipher_walk *walk,
> scatterwalk_copychunks(NULL, &walk->in, req->assoclen, 2);
> scatterwalk_copychunks(NULL, &walk->out, req->assoclen, 2);
>
> + scatterwalk_done(&walk->in, 0, walk->total);
> + scatterwalk_done(&walk->out, 0, walk->total);
That should be 1 instead of 0 for walk->out.
Could you please fix and resubmit?
Thanks,
--
Email: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx>
Home Page: http://gondor.apana.org.au/~herbert/
PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt
