tree 4550ea79e86f36c55b3bb853d19cd369879db1d6
parent 6223c1f703e514e20a8e4802a10f3f09c0817123
author Eric Biggers <ebiggers@google.com> 1529342557 -0700
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1534532628 +0200

crypto: vmac - require a block cipher with 128-bit block size

commit 73bf20ef3df262026c3470241ae4ac8196943ffa upstream.

The VMAC template assumes the block cipher has a 128-bit block size, but
it failed to check for that.  Thus it was possible to instantiate it
using a 64-bit block size cipher, e.g. "vmac(cast5)", causing
uninitialized memory to be used.

Add the needed check when instantiating the template.

Fixes: f1939f7c5645 ("crypto: vmac - New hash algorithm for intel_txt support")
Cc: <stable@vger.kernel.org> # v2.6.32+
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>