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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,
        syzbot+6f72c20560060c98b566@syzkaller.appspotmail.com,
        Herbert Xu <herbert@gondor.apana.org.au>,
        Ondrej Mosnacek <omosnace@redhat.com>
Subject: [PATCH 5.0 13/89] crypto: xts - Fix atomic sleep when walking skcipher
Date:   Tue, 30 Apr 2019 13:38:04 +0200
Message-Id: <20190430113610.342144523@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 44427c0fbc09b448b22410978a4ef6ee37599d25 upstream.

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

Reported-by: syzbot+6f72c20560060c98b566@syzkaller.appspotmail.com
Fixes: 78105c7e769b ("crypto: xts - Drop use of 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/xts.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

--- a/crypto/xts.c
+++ b/crypto/xts.c
@@ -137,8 +137,12 @@ 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);
 }