linux-kernel - [PATCH 4.9 027/129] net: qrtr: Stop rx

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Message-Id: <20191003154331.480674156@linuxfoundation.org>
Date:   Thu,  3 Oct 2019 17:52:30 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>
Subject: [PATCH 4.9 027/129] net: qrtr: Stop rx_worker before freeing node

From: Bjorn Andersson <bjorn.andersson@...aro.org>

[ Upstream commit 73f0c11d11329a0d6d205d4312b6e5d2512af7c5 ]

As the endpoint is unregistered there might still be work pending to
handle incoming messages, which will result in a use after free
scenario. The plan is to remove the rx_worker, but until then (and for
stable@) ensure that the work is stopped before the node is freed.

Fixes: bdabad3e363d ("net: Add Qualcomm IPC router")
Cc: stable@...r.kernel.org
Signed-off-by: Bjorn Andersson <bjorn.andersson@...aro.org>
Signed-off-by: Jakub Kicinski <jakub.kicinski@...ronome.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 net/qrtr/qrtr.c |    1 +
 1 file changed, 1 insertion(+)

--- a/net/qrtr/qrtr.c
+++ b/net/qrtr/qrtr.c
@@ -126,6 +126,7 @@ static void __qrtr_node_release(struct k
 	list_del(&node->item);
 	mutex_unlock(&qrtr_node_lock);
 
+	cancel_work_sync(&node->work);
 	skb_queue_purge(&node->rx_queue);
 	kfree(node);
 }