From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tadeusz Struk Subject: [PATCH v2 1/2] crypto: qat - Prevent dma mapping zero length assoc data Date: Mon, 13 Oct 2014 18:24:26 -0700 Message-ID: <20141014012426.742.51263.stgit@tstruk-mobl1> References: <20141014012251.742.5500.stgit@tstruk-mobl1> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Cc: prarit@redhat.com, bruce.w.allan@intel.com, qat-linux@intel.com, naleksan@redhat.com, linux-crypto@vger.kernel.org, davem@davemloft.net To: herbert@gondor.apana.org.au Return-path: Received: from mga03.intel.com ([134.134.136.65]:38033 "EHLO mga03.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753837AbaJNB0a (ORCPT ); Mon, 13 Oct 2014 21:26:30 -0400 In-Reply-To: <20141014012251.742.5500.stgit@tstruk-mobl1> Sender: linux-crypto-owner@vger.kernel.org List-ID: Do not attempt to dma map associated data if it is zero length. Signed-off-by: Tadeusz Struk --- drivers/crypto/qat/qat_common/qat_algs.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/crypto/qat/qat_common/qat_algs.c b/drivers/crypto/qat/qat_common/qat_algs.c index 3e26fa2..bd4bd27 100644 --- a/drivers/crypto/qat/qat_common/qat_algs.c +++ b/drivers/crypto/qat/qat_common/qat_algs.c @@ -608,6 +608,8 @@ static int qat_alg_sgl_to_bufl(struct qat_crypto_instance *inst, goto err; for_each_sg(assoc, sg, assoc_n, i) { + if (!sg->length) + continue; bufl->bufers[bufs].addr = dma_map_single(dev, sg_virt(sg), sg->length,