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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, Herbert Xu <herbert@gondor.apana.org.au>,
        Ondrej Mosnacek <omosnace@redhat.com>
Subject: [PATCH 5.0 14/89] crypto: lrw - Fix atomic sleep when walking skcipher
Date:   Tue, 30 Apr 2019 13:38:05 +0200
Message-Id: <20190430113610.371633316@linuxfoundation.org>
In-Reply-To: <20190430113609.741196396@linuxfoundation.org>
References: <20190430113609.741196396@linuxfoundation.org>
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From: Herbert Xu <herbert@gondor.apana.org.au>

commit b257b48cd5830c5b1d0c347eb281f9c28056f881 upstream.

When we perform a walk in the completion function, we need to ensure
that it is atomic.

Fixes: ac3c8f36c31d ("crypto: lrw - Do not use auxiliary buffer")
Cc: <stable@vger.kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Acked-by: Ondrej Mosnacek <omosnace@redhat.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 crypto/lrw.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

--- a/crypto/lrw.c
+++ b/crypto/lrw.c
@@ -212,8 +212,12 @@ static void crypt_done(struct crypto_asy
 {
 	struct skcipher_request *req = areq->data;
 
-	if (!err)
+	if (!err) {
+		struct rctx *rctx = skcipher_request_ctx(req);
+
+		rctx->subreq.base.flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
 		err = xor_tweak_post(req);
+	}
 
 	skcipher_request_complete(req, err);
 }