From d493ba54d96d117fb3dff027141444584f852054 Mon Sep 17 00:00:00 2001
From: Herbert Xu <herbert@gondor.apana.org.au>
Date: Tue, 13 Jan 2009 11:26:18 +1100
Subject: [PATCH] crypto: authenc - Fix zero-length IV crash

commit 29b37f42127f7da511560a40ea74f5047da40c13 upstream.

As it is if an algorithm with a zero-length IV is used (e.g.,
NULL encryption) with authenc, authenc may generate an SG entry
of length zero, which will trigger a BUG check in the hash layer.

This patch fixes it by skipping the IV SG generation if the IV
size is zero.

Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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