The per-cpu channel list is now referred to in the interrupt
routine. This is mostly safe since the host will not normally generate
an interrupt when channel is being deleted but if it did then there
would be a use after free problem.
To solve, this use RCU protection on ther per-cpu list.
Signed-off-by: Stephen Hemminger <sthemmin@xxxxxxxxxxxxx>
---
drivers/hv/channel_mgmt.c | 7 ++++---
drivers/hv/vmbus_drv.c | 6 +++++-
include/linux/hyperv.h | 7 +++++++
3 files changed, 16 insertions(+), 4 deletions(-)
diff --git a/drivers/hv/channel_mgmt.c b/drivers/hv/channel_mgmt.c
index f33465d78a02..d2cfa3eb71a2 100644
--- a/drivers/hv/channel_mgmt.c
+++ b/drivers/hv/channel_mgmt.c
@@ -350,7 +350,8 @@ static struct vmbus_channel *alloc_channel(void)
static void free_channel(struct vmbus_channel *channel)
{
tasklet_kill(&channel->callback_event);
- kfree(channel);
+
+ kfree_rcu(channel, rcu);
}
static void percpu_channel_enq(void *arg)
@@ -359,14 +360,14 @@ static void percpu_channel_enq(void *arg)
struct hv_per_cpu_context *hv_cpu
= this_cpu_ptr(hv_context.cpu_context);
- list_add_tail(&channel->percpu_list, &hv_cpu->chan_list);
+ list_add_tail_rcu(&channel->percpu_list, &hv_cpu->chan_list);
}
static void percpu_channel_deq(void *arg)
{
struct vmbus_channel *channel = arg;
- list_del(&channel->percpu_list);
+ list_del_rcu(&channel->percpu_list);
}
diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
index f7f6b9144b07..971ecb7c4795 100644
--- a/drivers/hv/vmbus_drv.c
+++ b/drivers/hv/vmbus_drv.c
@@ -937,8 +937,10 @@ static void vmbus_chan_sched(struct hv_per_cpu_context *hv_cpu)
if (relid == 0)
continue;
+ rcu_read_lock();
+
/* Find channel based on relid */
- list_for_each_entry(channel, &hv_cpu->chan_list, percpu_list) {
+ list_for_each_entry_rcu(channel, &hv_cpu->chan_list, percpu_list) {
if (channel->offermsg.child_relid != relid)
continue;
@@ -954,6 +956,8 @@ static void vmbus_chan_sched(struct hv_per_cpu_context *hv_cpu)
tasklet_schedule(&channel->callback_event);
}
}
+
+ rcu_read_unlock();
}
}
diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h
index 62bbf3c1aa4a..c4c7ae91f9d1 100644
--- a/include/linux/hyperv.h
+++ b/include/linux/hyperv.h
@@ -845,6 +845,13 @@ struct vmbus_channel {
* link up channels based on their CPU affinity.
*/
struct list_head percpu_list;
+
+ /*
+ * Defer freeing channel until after all cpu's have
+ * gone through grace period.
+ */
+ struct rcu_head rcu;
+
/*
* For performance critical channels (storage, networking
* etc,), Hyper-V has a mechanism to enhance the throughput
--
2.11.0
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