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drm/amdkfd: Create file descriptor after client is added to smi_clients list 

This ensures userspace cannot prematurely clean-up the client before
it is fully initialised which has been proven to cause issues in the
past.

Cc: Felix Kuehling <Felix.Kuehling@amd.com>
Cc: Alex Deucher <alexander.deucher@amd.com>
Cc: "Christian König" <christian.koenig@amd.com>
Cc: "Pan, Xinhui" <Xinhui.Pan@amd.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: amd-gfx@lists.freedesktop.org
Cc: dri-devel@lists.freedesktop.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@vger.kernel.org
This commit is contained in:
Lee Jones 2022-03-31 13:21:17 +01:00 committed by Alex Deucher
parent ef1a0808a2
commit e79a2398e1
1 changed files with 15 additions and 9 deletions
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24
drivers/gpu/drm/amd/amdkfd/kfd_smi_events.c
View File

@ -247,15 +247,6 @@ int kfd_smi_event_open(struct kfd_dev *dev, uint32_t *fd)
return ret;
}
ret = anon_inode_getfd(kfd_smi_name, &kfd_smi_ev_fops, (void *)client,
O_RDWR);
if (ret < 0) {
kfifo_free(&client->fifo);
kfree(client);
return ret;
}
*fd = ret;
init_waitqueue_head(&client->wait_queue);
spin_lock_init(&client->lock);
client->events = 0;
@ -265,5 +256,20 @@ int kfd_smi_event_open(struct kfd_dev *dev, uint32_t *fd)
list_add_rcu(&client->list, &dev->smi_clients);
spin_unlock(&dev->smi_lock);
ret = anon_inode_getfd(kfd_smi_name, &kfd_smi_ev_fops, (void *)client,
O_RDWR);
if (ret < 0) {
spin_lock(&dev->smi_lock);
list_del_rcu(&client->list);
spin_unlock(&dev->smi_lock);
synchronize_rcu();
kfifo_free(&client->fifo);
kfree(client);
return ret;
}
*fd = ret;
return 0;
}