[PATCH] net: qrtr: Stop rx_worker before freeing node

From: Bjorn Andersson <bjorn.andersson@linaro.org>
To: "David S. Miller" <davem@davemloft.net>
Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-arm-msm@vger.kernel.org,
	Srinivas Kandagatla <srinivas.kandagatla@linaro.org>,
	stable@vger.kernel.org
Subject: [PATCH] net: qrtr: Stop rx_worker before freeing node
Date: Wed, 18 Sep 2019 10:21:17 -0700	[thread overview]
Message-ID: <20190918172117.4116-1-bjorn.andersson@linaro.org> (raw)

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@vger.kernel.org
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
---
 net/qrtr/qrtr.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/net/qrtr/qrtr.c b/net/qrtr/qrtr.c
index 6c8b0f6d28f9..88f98f27ad88 100644
--- a/net/qrtr/qrtr.c
+++ b/net/qrtr/qrtr.c
@@ -150,6 +150,7 @@ static void __qrtr_node_release(struct kref *kref)
 	list_del(&node->item);
 	mutex_unlock(&qrtr_node_lock);
 
+	cancel_work_sync(&node->work);
 	skb_queue_purge(&node->rx_queue);
 	kfree(node);
 }
-- 
2.18.0

