[PATCH v1] drm/amdkfd: Check for potential null return of kmalloc_array()

[QintaoShen]

As the kmalloc_array() may return null, the 'event_waiters[i].wait' would lead 
to null-pointer dereference.
Therefore, it is better to check the return value of kmalloc_array() to avoid 
this confusion.

Signed-off-by: QintaoShen <unsimple1...@163.com>
---
 drivers/gpu/drm/amd/amdkfd/kfd_events.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_events.c 
b/drivers/gpu/drm/amd/amdkfd/kfd_events.c
index deeccce..64f4a51 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_events.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_events.c
@@ -749,6 +749,8 @@ static struct kfd_event_waiter 
*alloc_event_waiters(uint32_t num_events)
        event_waiters = kmalloc_array(num_events,
                                        sizeof(struct kfd_event_waiter),
                                        GFP_KERNEL);
+       if (!event_waiters)
+               return NULL;
 
        for (i = 0; (event_waiters) && (i < num_events) ; i++) {
                init_wait(&event_waiters[i].wait);
-- 
2.7.4