crypto: authenc - Fix zero-length IV crash
commitd493ba54d96d117fb3dff027141444584f852054
authorHerbert Xu <herbert@gondor.apana.org.au>
Tue, 13 Jan 2009 00:26:18 +0000 (13 11:26 +1100)
committerGreg Kroah-Hartman <gregkh@suse.de>
Mon, 2 Feb 2009 16:28:12 +0000 (2 08:28 -0800)
tree8d493b7284107d16f46d1744673f9cb7f81739cd
parente230bf234f40f493a284c4dbcec0b331529b609f
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>
crypto/authenc.c