[PATCH] drm/i915/selftests: Fix error pointer vs NULL in __mock_request_alloc()

[Dan Carpenter]

The __mock_request_alloc() implements the smoketest->request_alloc()
function pointer.  It's called from __igt_breadcrumbs_smoketest().
It's supposed to return error pointers, and returning NULL will lead to
a NULL pointer dereference.

Fixes: 52c0fdb25c7c ("drm/i915: Replace global breadcrumbs with per-context 
interrupt tracking")
Signed-off-by: Dan Carpenter <dan.carpen...@linaro.org>
---
 drivers/gpu/drm/i915/selftests/i915_request.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/selftests/i915_request.c 
b/drivers/gpu/drm/i915/selftests/i915_request.c
index 88870844b5bd..e349244a5fba 100644
--- a/drivers/gpu/drm/i915/selftests/i915_request.c
+++ b/drivers/gpu/drm/i915/selftests/i915_request.c
@@ -290,7 +290,12 @@ struct smoketest {
 static struct i915_request *
 __mock_request_alloc(struct intel_context *ce)
 {
-       return mock_request(ce, 0);
+       struct i915_request *rq;
+
+       rq = mock_request(ce, 0);
+       if (!rq)
+               return ERR_PTR(-ENOMEM);
+       return rq;
 }
 
 static struct i915_request *
-- 
2.47.2