crypto: lrw - Fix atomic sleep when walking skcipher

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>

diff --git a/crypto/lrw.c b/crypto/lrw.c
index 0430ccd08728655ecf4e44c65ef16e956bd928c1..08a0e458bc3e62dcb17e0dbec9151290b895aa33 100644 (file)
--- a/crypto/lrw.c
+++ b/crypto/lrw.c
@@ -212,8 +212,12 @@ static void crypt_done(struct crypto_async_request *areq, int err)
 {
        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);
 }