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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Gilad Ben-Yossef <gilad@benyossef.com>,
        Geert Uytterhoeven <geert+renesas@glider.be>,
        Herbert Xu <herbert@gondor.apana.org.au>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 4.19 138/146] crypto: ccree - dec auth tag size from cryptlen map
Date:   Thu, 16 Apr 2020 15:24:39 +0200
Message-Id: <20200416131301.253367669@linuxfoundation.org>
In-Reply-To: <20200416131242.353444678@linuxfoundation.org>
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From: Gilad Ben-Yossef <gilad@benyossef.com>

[ Upstream commit 8962c6d2c2b8ca51b0f188109015b15fc5f4da44 ]

Remove the auth tag size from cryptlen before mapping the destination
in out-of-place AEAD decryption thus resolving a crash with
extended testmgr tests.

Signed-off-by: Gilad Ben-Yossef <gilad@benyossef.com>
Reported-by: Geert Uytterhoeven <geert+renesas@glider.be>
Cc: stable@vger.kernel.org # v4.19+
Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/crypto/ccree/cc_buffer_mgr.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/crypto/ccree/cc_buffer_mgr.c b/drivers/crypto/ccree/cc_buffer_mgr.c
index 6681d113c0d67..77e31191e408a 100644
--- a/drivers/crypto/ccree/cc_buffer_mgr.c
+++ b/drivers/crypto/ccree/cc_buffer_mgr.c
@@ -1021,8 +1021,12 @@ static int cc_aead_chain_data(struct cc_drvdata *drvdata,
 
 	if (req->src != req->dst) {
 		size_for_map = areq_ctx->assoclen + req->cryptlen;
-		size_for_map += (direct == DRV_CRYPTO_DIRECTION_ENCRYPT) ?
-				authsize : 0;
+
+		if (direct == DRV_CRYPTO_DIRECTION_ENCRYPT)
+			size_for_map += authsize;
+		else
+			size_for_map -= authsize;
+
 		if (is_gcm4543)
 			size_for_map += crypto_aead_ivsize(tfm);
 
-- 
2.20.1