tree 6d612f29ee44e877b4fb546898f729f135ac9900
parent 9039f3ef446e9ffa200200c934f049add9e58426
author Herbert Xu <herbert@gondor.apana.org.au> 1507346988 +0800
committer Herbert Xu <herbert@gondor.apana.org.au> 1507349072 +0800

crypto: skcipher - Fix crash on zero-length input

The skcipher walk interface doesn't handle zero-length input
properly as the old blkcipher walk interface did.  This is due
to the fact that the length check is done too late.

This patch moves the length check forward so that it does the
right thing.

Fixes: b286d8b1a690 ("crypto: skcipher - Add skcipher walk...")
Cc: <stable@vger.kernel.org>
Reported-by: Stephan Müller <smueller@chronox.de>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>