| Message ID | 20220401104451.1951544-1-lee.jones@linaro.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [v2,1/1] drm/amdkfd: Create file descriptor after client is added to smi_clients list | expand |
On Fri, 01 Apr 2022, Lee Jones wrote: > 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> > --- > > CAVEAT: This patch is completely untested > I can't seem to find a configuration strategy to compile test this > allyesconfig and allmodconfig do not appear sufficient > > v2: Also remove Client from RCU list in error path > > drivers/gpu/drm/amd/amdkfd/kfd_smi_events.c | 24 +++++++++++++-------- > 1 file changed, 15 insertions(+), 9 deletions(-) Please ignore this re-submission, script error.
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_smi_events.c b/drivers/gpu/drm/amd/amdkfd/kfd_smi_events.c index e4beebb1c80a2..f2e1d506ba211 100644 --- a/drivers/gpu/drm/amd/amdkfd/kfd_smi_events.c +++ b/drivers/gpu/drm/amd/amdkfd/kfd_smi_events.c @@ -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; }
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> --- CAVEAT: This patch is completely untested I can't seem to find a configuration strategy to compile test this allyesconfig and allmodconfig do not appear sufficient v2: Also remove Client from RCU list in error path drivers/gpu/drm/amd/amdkfd/kfd_smi_events.c | 24 +++++++++++++-------- 1 file changed, 15 insertions(+), 9 deletions(-)