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Subject[PATCH 4.19 29/47] rpmsg: glink: Dont send pending rx_done during remove
Date
From: Bjorn Andersson <bjorn.andersson@linaro.org>

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 <clew@codeaurora.org>
Tested-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
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);

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