drm/amdkfd: Check for potential null return of kmalloc_array()

[ Upstream commit ebbb7bb9e80305820dc2328a371c1b35679f2667 ]

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 <unSimple1993@163.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_events.c b/drivers/gpu/drm/amd/amdkfd/kfd_events.c
index 944abfad39c1f67447ca720d5e47c4b086336a82..1d8dd81dfc701f99af14c441d3b233a9fa1753de 100644 (file)
--- a/drivers/gpu/drm/amd/amdkfd/kfd_events.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_events.c
@@ -607,6 +607,8 @@ 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_LIST_HEAD(&event_waiters[i].waiters);