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[209.132.180.67]) by mx.google.com with ESMTP id y8si3720717otg.309.2019.12.19.10.52.35; Thu, 19 Dec 2019 10:52:35 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@kernel.org header.s=default header.b=sBRkrpSy; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729411AbfLSSwd (ORCPT + 27 others); Thu, 19 Dec 2019 13:52:33 -0500 Received: from mail.kernel.org ([198.145.29.99]:47084 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727675AbfLSSw2 (ORCPT ); Thu, 19 Dec 2019 13:52:28 -0500 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id A49DB222C2; Thu, 19 Dec 2019 18:52:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1576781547; bh=Vmz3wYOJbZc0L0QOMOlJVhOavn4fujjmfqInOPz+33k=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=sBRkrpSy24Z+J0vXZHAaK+/hJ05TAEc8gw6UW0X30nJZKlvlsdLFyx3er3YQE2hVY 88B7rtGz2hkgq47pOavaKsQSApQ3UtSVUFRIr8BRKqP2hwawNlJ0Y51sPC/e4SMmUl k0zaTbQFu265386LrM6LASGe94tr4G+94t581xp0= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Chris Lew , Srinivas Kandagatla , Bjorn Andersson Subject: [PATCH 4.19 29/47] rpmsg: glink: Dont send pending rx_done during remove Date: Thu, 19 Dec 2019 19:34:43 +0100 Message-Id: <20191219182933.427327141@linuxfoundation.org> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20191219182857.659088743@linuxfoundation.org> References: <20191219182857.659088743@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Bjorn Andersson commit c3dadc19b7564c732598b30d637c6f275c3b77b6 upstream. Attempting to transmit rx_done messages after the GLINK instance is being torn down will cause use after free and memory leaks. So cancel the intent_work and free up the pending intents. With this there are no concurrent accessors of the channel left during qcom_glink_native_remove() and there is therefor no need to hold the spinlock during this operation - which would prohibit the use of cancel_work_sync() in the release function. So remove this. Fixes: 1d2ea36eead9 ("rpmsg: glink: Add rx done command") Cc: stable@vger.kernel.org Acked-by: Chris Lew Tested-by: Srinivas Kandagatla Signed-off-by: Bjorn Andersson Signed-off-by: Greg Kroah-Hartman --- drivers/rpmsg/qcom_glink_native.c | 15 ++++++++++++--- 1 file changed, 12 insertions(+), 3 deletions(-) --- a/drivers/rpmsg/qcom_glink_native.c +++ b/drivers/rpmsg/qcom_glink_native.c @@ -241,11 +241,23 @@ static void qcom_glink_channel_release(s { struct glink_channel *channel = container_of(ref, struct glink_channel, refcount); + struct glink_core_rx_intent *intent; struct glink_core_rx_intent *tmp; unsigned long flags; int iid; + /* cancel pending rx_done work */ + cancel_work_sync(&channel->intent_work); + spin_lock_irqsave(&channel->intent_lock, flags); + /* Free all non-reuse intents pending rx_done work */ + list_for_each_entry_safe(intent, tmp, &channel->done_intents, node) { + if (!intent->reuse) { + kfree(intent->data); + kfree(intent); + } + } + idr_for_each_entry(&channel->liids, tmp, iid) { kfree(tmp->data); kfree(tmp); @@ -1628,7 +1640,6 @@ void qcom_glink_native_remove(struct qco struct glink_channel *channel; int cid; int ret; - unsigned long flags; disable_irq(glink->irq); cancel_work_sync(&glink->rx_work); @@ -1637,7 +1648,6 @@ void qcom_glink_native_remove(struct qco if (ret) dev_warn(glink->dev, "Can't remove GLINK devices: %d\n", ret); - spin_lock_irqsave(&glink->idr_lock, flags); /* Release any defunct local channels, waiting for close-ack */ idr_for_each_entry(&glink->lcids, channel, cid) kref_put(&channel->refcount, qcom_glink_channel_release); @@ -1648,7 +1658,6 @@ void qcom_glink_native_remove(struct qco idr_destroy(&glink->lcids); idr_destroy(&glink->rcids); - spin_unlock_irqrestore(&glink->idr_lock, flags); mbox_free_channel(glink->mbox_chan); } EXPORT_SYMBOL_GPL(qcom_glink_native_remove);