From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tadeusz Struk Subject: [PATCH 1/2] crypto: qat - Prevent dma mapping zero length assoc data. Date: Wed, 08 Oct 2014 10:38:47 -0700 Message-ID: <20141008173847.13714.98215.stgit@tstruk-mobl1> References: <20141008173750.13714.49713.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, john.griffin@intel.com, linux-crypto@vger.kernel.org, naleksan@redhat.com, davem@davemloft.net To: herbert@gondor.apana.org.au Return-path: Received: from mga14.intel.com ([192.55.52.115]:57810 "EHLO mga14.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751223AbaJHRqn (ORCPT ); Wed, 8 Oct 2014 13:46:43 -0400 In-Reply-To: <20141008173750.13714.49713.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 e03afe9..bffa8bf 100644 --- a/drivers/crypto/qat/qat_common/qat_algs.c +++ b/drivers/crypto/qat/qat_common/qat_algs.c @@ -607,6 +607,8 @@ 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,