[Intel-gfx] [PATCH] drm/i915: Reject invalid-pad for context-destroy ioctl

[Chris Wilson]

Unknown parameters, especially structure padding, are expected to invoke
rejection with -EINVAL.

Testcase: igt/gem_ctx_bad_destroy/invalid-pad
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=89602
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Daniel Vetter <daniel.vetter at ffwll.ch>
---
 drivers/gpu/drm/i915/i915_gem_context.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_gem_context.c b/drivers/gpu/drm/i915/i915_gem_context.c
index 060e902afd1c..baabbd6488d8 100644
--- a/drivers/gpu/drm/i915/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/i915_gem_context.c
@@ -1001,6 +1001,9 @@ int i915_gem_context_destroy_ioctl(struct drm_device *dev, void *data,
 	struct intel_context *ctx;
 	int ret;
 
+	if (args->pad != 0)
+		return -EINVAL;
+
 	if (args->ctx_id == DEFAULT_CONTEXT_HANDLE)
 		return -ENOENT;
 
-- 
2.7.0.rc3