crypto: authencesn - Fix digest_null crash
authorHerbert Xu <herbert@gondor.apana.org.au>
Mon, 17 Jul 2017 07:32:30 +0000 (15:32 +0800)
committerHerbert Xu <herbert@gondor.apana.org.au>
Tue, 18 Jul 2017 09:01:11 +0000 (17:01 +0800)
commit41cdf7a45389e01991ee31e3301ed83cb3e3f7dc
treedf34fc42687bb28c8d800fb71bb6b0bf1eaa1973
parentefc856edfd66acc5da34fec92d7feca6fd0f9add
crypto: authencesn - Fix digest_null crash

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...")
Cc: <stable@vger.kernel.org>
Reported-by: Jan Tluka <jtluka@redhat.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
crypto/authencesn.c