From: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Date: Tue, 12 Nov 2013 17:49:35 +0000 (+0200)
Subject: drm/i915: check i915_get_reset_stats_ioctl args
X-Git-Tag: firefly_0821_release~176^2~4523^2~90^2~52
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=661df0415e6f6bfaade501fb94cc324fa44f29b4;p=firefly-linux-kernel-4.4.55.git

drm/i915: check i915_get_reset_stats_ioctl args

Insist that flags and pad fields are zero, so that
we can safely extend the interface in future.

Testcase: igt/gem_reset_stats/params

Suggested-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Mika Kuoppala <mika.kuoppala@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---

diff --git a/drivers/gpu/drm/i915/intel_uncore.c b/drivers/gpu/drm/i915/intel_uncore.c
index 21cf9519be78..a881906969eb 100644
--- a/drivers/gpu/drm/i915/intel_uncore.c
+++ b/drivers/gpu/drm/i915/intel_uncore.c
@@ -641,6 +641,9 @@ int i915_get_reset_stats_ioctl(struct drm_device *dev,
 	struct i915_ctx_hang_stats *hs;
 	int ret;
 
+	if (args->flags || args->pad)
+		return -EINVAL;
+
 	if (args->ctx_id == DEFAULT_CONTEXT_ID && !capable(CAP_SYS_ADMIN))
 		return -EPERM;