Presently the Client can be freed whilst still in use.
Use the already provided lock to prevent this.
Cc: Felix Kuehling <Felix.Kuehling@xxxxxxx>
Cc: Alex Deucher <alexander.deucher@xxxxxxx>
Cc: "Christian König" <christian.koenig@xxxxxxx>
Cc: "Pan, Xinhui" <Xinhui.Pan@xxxxxxx>
Cc: David Airlie <airlied@xxxxxxxx>
Cc: Daniel Vetter <daniel@xxxxxxxx>
Cc: amd-gfx@xxxxxxxxxxxxxxxxxxxxx
Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx
Signed-off-by: Lee Jones <lee.jones@xxxxxxxxxx>
---
drivers/gpu/drm/amd/amdkfd/kfd_smi_events.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_smi_events.c b/drivers/gpu/drm/amd/amdkfd/kfd_smi_events.c
index e4beebb1c80a2..3b9ac1e87231f 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_smi_events.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_smi_events.c
@@ -145,8 +145,11 @@ static int kfd_smi_ev_release(struct inode *inode, struct file *filep)
spin_unlock(&dev->smi_lock);
synchronize_rcu();
+
+ spin_lock(&client->lock);
kfifo_free(&client->fifo);
kfree(client);
+ spin_unlock(&client->lock);
return 0;
}
@@ -247,11 +250,13 @@ int kfd_smi_event_open(struct kfd_dev *dev, uint32_t *fd)
return ret;
}
+ spin_lock(&client->lock);
ret = anon_inode_getfd(kfd_smi_name, &kfd_smi_ev_fops, (void *)client,
O_RDWR);
if (ret < 0) {
kfifo_free(&client->fifo);
kfree(client);
+ spin_unlock(&client->lock);
return ret;
}
*fd = ret;
@@ -264,6 +269,7 @@ int kfd_smi_event_open(struct kfd_dev *dev, uint32_t *fd)
spin_lock(&dev->smi_lock);
list_add_rcu(&client->list, &dev->smi_clients);
spin_unlock(&dev->smi_lock);
+ spin_unlock(&client->lock);
return 0;
}
--
2.35.1.894.gb6a874cedc-goog
