linux-kernel - [PATCH 5.6 187/254] crypto: ccree - dec auth tag size from cryptlen map

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Date:   Thu, 16 Apr 2020 15:24:36 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Gilad Ben-Yossef <gilad@...yossef.com>,
        Geert Uytterhoeven <geert+renesas@...der.be>,
        Herbert Xu <herbert@...dor.apana.org.au>
Subject: [PATCH 5.6 187/254] crypto: ccree - dec auth tag size from cryptlen map

From: Gilad Ben-Yossef <gilad@...yossef.com>

commit 8962c6d2c2b8ca51b0f188109015b15fc5f4da44 upstream.

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@...yossef.com>
Reported-by: Geert Uytterhoeven <geert+renesas@...der.be>
Cc: stable@...r.kernel.org # v4.19+
Tested-by: Geert Uytterhoeven <geert+renesas@...der.be>
Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/crypto/ccree/cc_buffer_mgr.c |    8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

--- a/drivers/crypto/ccree/cc_buffer_mgr.c
+++ b/drivers/crypto/ccree/cc_buffer_mgr.c
@@ -894,8 +894,12 @@ static int cc_aead_chain_data(struct cc_
 
 	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);