crypto: ahash - fix another early termination in hash walk
authorEric Biggers <ebiggers@google.com>
Fri, 1 Feb 2019 07:51:41 +0000 (23:51 -0800)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Sat, 23 Mar 2019 19:09:40 +0000 (20:09 +0100)
commit3c5d7703bbd04bc9e5743810dff430583afcb236
tree2b7bebb76906c7be0932c2616c267e4709e6866b
parent1a10e6b5bb34e7f94c138d64498e2f2aaad02d9a
crypto: ahash - fix another early termination in hash walk

commit 77568e535af7c4f97eaef1e555bf0af83772456c upstream.

Hash algorithms with an alignmask set, e.g. "xcbc(aes-aesni)" and
"michael_mic", fail the improved hash tests because they sometimes
produce the wrong digest.  The bug is that in the case where a
scatterlist element crosses pages, not all the data is actually hashed
because the scatterlist walk terminates too early.  This happens because
the 'nbytes' variable in crypto_hash_walk_done() is assigned the number
of bytes remaining in the page, then later interpreted as the number of
bytes remaining in the scatterlist element.  Fix it.

Fixes: 900a081f6912 ("crypto: ahash - Fix early termination in hash walk")
Cc: stable@vger.kernel.org
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
crypto/ahash.c