From a68a193805224d90bedd94e9e8ac287600f07b78 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Horia=20Geant=C4=83?= <horia.geanta@nxp.com>
Date: Mon, 10 Jul 2017 08:40:30 +0300
Subject: [PATCH] crypto: caam/qi - properly set IV after {en,de}crypt
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Git-commit: a68a193805224d90bedd94e9e8ac287600f07b78
Patch-mainline: v4.14-rc1
References: bsc#1051510

caam/qi needs a fix similar to what was done for caam/jr in
commit "crypto: caam/qi - properly set IV after {en,de}crypt",
to allow for ablkcipher/skcipher chunking/streaming.

Cc: <stable@vger.kernel.org>
Fixes: b189817cf789 ("crypto: caam/qi - add ablkcipher and authenc algorithms")
Suggested-by: David Gstir <david@sigma-star.at>
Signed-off-by: Horia Geantă <horia.geanta@nxp.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/crypto/caam/caamalg_qi.c |    9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

--- a/drivers/crypto/caam/caamalg_qi.c
+++ b/drivers/crypto/caam/caamalg_qi.c
@@ -776,9 +776,9 @@ static void ablkcipher_done(struct caam_
 	struct crypto_ablkcipher *ablkcipher = crypto_ablkcipher_reqtfm(req);
 	struct caam_ctx *caam_ctx = crypto_ablkcipher_ctx(ablkcipher);
 	struct device *qidev = caam_ctx->qidev;
-#ifdef DEBUG
 	int ivsize = crypto_ablkcipher_ivsize(ablkcipher);
 
+#ifdef DEBUG
 	dev_err(qidev, "%s %d: status 0x%x\n", __func__, __LINE__, status);
 #endif
 
@@ -799,6 +799,13 @@ static void ablkcipher_done(struct caam_
 	ablkcipher_unmap(qidev, edesc, req);
 	qi_cache_free(edesc);
 
+	/*
+	 * The crypto API expects us to set the IV (req->info) to the last
+	 * ciphertext block. This is used e.g. by the CTS mode.
+	 */
+	scatterwalk_map_and_copy(req->info, req->dst, req->nbytes - ivsize,
+				 ivsize, 0);
+
 	ablkcipher_request_complete(req, status);
 }