[PATCH 5/6] rpmsg: glink: Don't send pending rx_done during remove

[Bjorn Andersson]

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.

Fixes: 1d2ea36eead9 ("rpmsg: glink: Add rx done command")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Bjorn Andersson <bjorn.andersson@xxxxxxxxxx>
---
 drivers/rpmsg/qcom_glink_native.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/rpmsg/qcom_glink_native.c b/drivers/rpmsg/qcom_glink_native.c
index 89e02baea2d0..0d7518a6ebf0 100644
--- a/drivers/rpmsg/qcom_glink_native.c
+++ b/drivers/rpmsg/qcom_glink_native.c
@@ -241,11 +241,23 @@ static void qcom_glink_channel_release(struct kref *ref)
 {
 	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);
-- 
2.18.0