From 35a6ba636bbf1ba8cbf9476c5e02460592a7fef9 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Ondrej=20Mosn=C3=A1=C4=8Dek?= <omosnacek@gmail.com>
Date: Fri, 23 Sep 2016 10:47:32 +0200
Subject: [PATCH] crypto: gcm - Fix IV buffer size in crypto_gcm_setkey

commit 50d2e6dc1f83db0563c7d6603967bf9585ce934b upstream.

The cipher block size for GCM is 16 bytes, and thus the CTR transform
used in crypto_gcm_setkey() will also expect a 16-byte IV. However,
the code currently reserves only 8 bytes for the IV, causing
an out-of-bounds access in the CTR transform. This patch fixes
the issue by setting the size of the IV buffer to 16 bytes.

Fixes: 84c911523020 ("[CRYPTO] gcm: Add support for async ciphers")
Signed-off-by: Ondrej Mosnacek <omosnacek@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
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