crypto: skcipher - Fix crash on zero-length input
authorHerbert Xu <herbert@gondor.apana.org.au>
Sat, 7 Oct 2017 03:29:48 +0000 (11:29 +0800)
committerHerbert Xu <herbert@gondor.apana.org.au>
Sat, 7 Oct 2017 04:04:32 +0000 (12:04 +0800)
commit0cabf2af6f5ac3c88cb106c4e06087a5a39b8e1e
tree6d612f29ee44e877b4fb546898f729f135ac9900
parent9039f3ef446e9ffa200200c934f049add9e58426
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>
crypto/skcipher.c