From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2E2DAC432C0 for ; Wed, 20 Nov 2019 17:35:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 0F2C62088F for ; Wed, 20 Nov 2019 17:35:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728786AbfKTRfR (ORCPT ); Wed, 20 Nov 2019 12:35:17 -0500 Received: from youngberry.canonical.com ([91.189.89.112]:49624 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728448AbfKTRfR (ORCPT ); Wed, 20 Nov 2019 12:35:17 -0500 Received: from 1.general.cking.uk.vpn ([10.172.193.212] helo=localhost) by youngberry.canonical.com with esmtpsa (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.86_2) (envelope-from ) id 1iXTsj-0006qN-T8; Wed, 20 Nov 2019 17:35:09 +0000 From: Colin King To: Maarten Lankhorst , Maxime Ripard , Sean Paul , David Airlie , Daniel Vetter , Lyude Paul , dri-devel@lists.freedesktop.org Cc: kernel-janitors@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH][next] drm/dp_mst: fix multiple frees of tx->bytes Date: Wed, 20 Nov 2019 17:35:09 +0000 Message-Id: <20191120173509.347490-1-colin.king@canonical.com> X-Mailer: git-send-email 2.24.0 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Colin Ian King Currently tx->bytes is being freed r->num_transactions number of times because tx is not being set correctly. Fix this by setting tx to &r->transactions[i] so that the correct objects are being freed on each loop iteration. Addresses-Coverity: ("Double free") Fixes: 2f015ec6eab6 ("drm/dp_mst: Add sideband down request tracing + selftests") Signed-off-by: Colin Ian King --- drivers/gpu/drm/drm_dp_mst_topology.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c index ae5809a1f19a..2754e7e075e7 100644 --- a/drivers/gpu/drm/drm_dp_mst_topology.c +++ b/drivers/gpu/drm/drm_dp_mst_topology.c @@ -517,8 +517,10 @@ drm_dp_decode_sideband_req(const struct drm_dp_sideband_msg_tx *raw, } if (failed) { - for (i = 0; i < r->num_transactions; i++) + for (i = 0; i < r->num_transactions; i++) { + tx = &r->transactions[i]; kfree(tx->bytes); + } return -ENOMEM; } -- 2.24.0