[PATCH][drm-next] drm/i915: Check for allocation failure

[Colin King]

From: Colin Ian King <colin.king at canonical.com>

The memory allocation for C is not being null checked and hence we
could end up with a null pointer dereference. Fix this with a null
pointer check. (I really should have noticed this when I was fixing an
earlier issue.)

Detected by CoverityScan, CID#1436406 ("Dereference null return")

Fixes: 47624cc3301b60 ("drm/i915: Import the kfence selftests for i915_sw_fence")
Signed-off-by: Colin Ian King <colin.king at canonical.com>
---
 drivers/gpu/drm/i915/selftests/i915_sw_fence.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/gpu/drm/i915/selftests/i915_sw_fence.c b/drivers/gpu/drm/i915/selftests/i915_sw_fence.c
index c31d439fae3a..33128be77bbe 100644
--- a/drivers/gpu/drm/i915/selftests/i915_sw_fence.c
+++ b/drivers/gpu/drm/i915/selftests/i915_sw_fence.c
@@ -123,6 +123,10 @@ static int test_dag(void *arg)
 	}
 
 	C = alloc_fence();
+	if (!C) {
+		ret = -ENOMEM;
+		goto err_B;
+	}
 	if (i915_sw_fence_await_sw_fence_gfp(B, C, GFP_KERNEL) == -EINVAL) {
 		pr_err("invalid cycle detected\n");
 		goto err_C;
-- 
2.11.0