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authorBjorn Andersson <bjorn.andersson@linaro.org>2019-10-04 15:27:01 -0700
committerBjorn Andersson <bjorn.andersson@linaro.org>2019-10-17 06:23:10 -0700
commitc3dadc19b7564c732598b30d637c6f275c3b77b6 (patch)
treeb6f01b54f11cea981a8a7123213b565b07f07643 /drivers/rpmsg/qcom_glink_native.c
parentf7e714988edaffe6ac578318e99501149b067ba0 (diff)
downloadlinux-c3dadc19b7564c732598b30d637c6f275c3b77b6.tar.gz
rpmsg: glink: Don't send pending rx_done during remove
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>
Diffstat (limited to 'drivers/rpmsg/qcom_glink_native.c')
-rw-r--r--drivers/rpmsg/qcom_glink_native.c15
1 files changed, 12 insertions, 3 deletions
diff --git a/drivers/rpmsg/qcom_glink_native.c b/drivers/rpmsg/qcom_glink_native.c
index 89e02baea2d0..38599ff2b0a2 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);
@@ -1625,7 +1637,6 @@ void qcom_glink_native_remove(struct qcom_glink *glink)
struct glink_channel *channel;
int cid;
int ret;
- unsigned long flags;
disable_irq(glink->irq);
cancel_work_sync(&glink->rx_work);
@@ -1634,7 +1645,6 @@ void qcom_glink_native_remove(struct qcom_glink *glink)
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);
@@ -1645,7 +1655,6 @@ void qcom_glink_native_remove(struct qcom_glink *glink)
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);