Quoting Oded Gabbay oded.gabbay@gmail.com:

On Thu, Jan 11, 2018 at 1:15 AM, Gustavo A. R. Silva garsilva@embeddedor.com wrote:

...

In case kfd_get_process_device_data returns null, there are some null pointer dereferences in functions kfd_bind_processes_to_device and kfd_unbind_processes_from_device.

Fix this by printing a WARN_ON for PDDs that aren't found and skip them with continue statements.

Addresses-Coverity-ID: 1463794 ("Dereference null return value") Addresses-Coverity-ID: 1463772 ("Dereference null return value") Suggested-by: Felix Kuehling felix.kuehling@amd.com Signed-off-by: Gustavo A. R. Silva garsilva@embeddedor.com

---

Changes in v2: Print a WARN_ON and skip PDDs that aren't found instead of returning an error.

drivers/gpu/drm/amd/amdkfd/kfd_process.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_process.c b/drivers/gpu/drm/amd/amdkfd/kfd_process.c index a22fb071..4ff5f0f 100644 --- a/drivers/gpu/drm/amd/amdkfd/kfd_process.c +++ b/drivers/gpu/drm/amd/amdkfd/kfd_process.c @@ -461,7 +461,8 @@ int kfd_bind_processes_to_device(struct kfd_dev *dev) hash_for_each_rcu(kfd_processes_table, temp, p, kfd_processes) { mutex_lock(&p->mutex); pdd = kfd_get_process_device_data(dev, p);

•           if (pdd->bound != PDD_BOUND_SUSPENDED) {
  

•           if (WARN_ON(!pdd) || pdd->bound != PDD_BOUND_SUSPENDED) {
                    mutex_unlock(&p->mutex);
                    continue;
            }
  

@@ -501,6 +502,11 @@ void kfd_unbind_processes_from_device(struct kfd_dev *dev) mutex_lock(&p->mutex); pdd = kfd_get_process_device_data(dev, p);

•           if (WARN_ON(!pdd)) {
  

•                   mutex_unlock(&p->mutex);
  

•                   continue;
  

•           }
  

•           if (pdd->bound == PDD_BOUND)
                    pdd->bound = PDD_BOUND_SUSPENDED;
            mutex_unlock(&p->mutex);
  

-- 2.7.4

This patch is: Reviewed-by: Oded Gabbay oded.gabbay@gmail.com

Thank you, Oded. -- Gustavo