tree c1671c4fbfeb0a9da598ebe3285b0d2c559b2c7b
parent 7d2a354861e9257824a201d39a11e6a4d2a60cb4
author Herbert Xu <herbert@gondor.apana.org.au> 1500276750 +0800
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1502071180 -0700

crypto: authencesn - Fix digest_null crash

commit 41cdf7a45389e01991ee31e3301ed83cb3e3f7dc upstream.

When authencesn is used together with digest_null a crash will
occur on the decrypt path.  This is because normally we perform
a special setup to preserve the ESN, but this is skipped if there
is no authentication.  However, on the post-authentication path
it always expects the preservation to be in place, thus causing
a crash when digest_null is used.

This patch fixes this by also skipping the post-processing when
there is no authentication.

Fixes: 104880a6b470 ("crypto: authencesn - Convert to new AEAD...")
Reported-by: Jan Tluka <jtluka@redhat.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>