linux-kernel - [PATCH 4.4 067/118] crypto: cryptd - initialize child shash

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Date:   Thu, 22 Sep 2016 19:29:27 +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, Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Herbert Xu <herbert@...dor.apana.org.au>
Subject: [PATCH 4.4 067/118] crypto: cryptd - initialize child shash_desc on import

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Ard Biesheuvel <ard.biesheuvel@...aro.org>

commit 0bd2223594a4dcddc1e34b15774a3a4776f7749e upstream.

When calling .import() on a cryptd ahash_request, the structure members
that describe the child transform in the shash_desc need to be initialized
like they are when calling .init()

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@...aro.org>
Signed-off-by: Herbert Xu <herbert@...dor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 crypto/cryptd.c |    9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

--- a/crypto/cryptd.c
+++ b/crypto/cryptd.c
@@ -594,9 +594,14 @@ static int cryptd_hash_export(struct aha
 
 static int cryptd_hash_import(struct ahash_request *req, const void *in)
 {
-	struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
+	struct crypto_ahash *tfm = crypto_ahash_reqtfm(req);
+	struct cryptd_hash_ctx *ctx = crypto_ahash_ctx(tfm);
+	struct shash_desc *desc = cryptd_shash_desc(req);
 
-	return crypto_shash_import(&rctx->desc, in);
+	desc->tfm = ctx->child;
+	desc->flags = req->base.flags;
+
+	return crypto_shash_import(desc, in);
 }
 
 static int cryptd_create_hash(struct crypto_template *tmpl, struct rtattr **tb,