drm/i915/query: Protect tainted function pointer lookup

Smatch identifies i915_query_ioctl() as being a potential victim of
Spectre due to its use of a tainted user index into a function pointer
array. Use array_index_nospec() to defang the user index before using it
to lookup the function pointer.

Fixes: a446ae2c6e65 ("drm/i915: add query uAPI")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180521210530.26008-1-chris@chris-wilson.co.uk
(cherry picked from commit 84b510e22da7926522a257cfe295d3695346a0bd)
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>

diff --git a/drivers/gpu/drm/i915/i915_query.c b/drivers/gpu/drm/i915/i915_query.c
index 3ace929..95f9d17 100644 (file)
--- a/drivers/gpu/drm/i915/i915_query.c
+++ b/drivers/gpu/drm/i915/i915_query.c
@@ -4,6 +4,8 @@
  * Copyright © 2018 Intel Corporation
  */
 
+#include <linux/nospec.h>
+
 #include "i915_drv.h"
 #include "i915_query.h"
 #include <uapi/drm/i915_drm.h>
@@ -111,10 +113,12 @@ int i915_query_ioctl(struct drm_device *dev, void *data, struct drm_file *file)
 
                func_idx = item.query_id - 1;
 
-               if (func_idx < ARRAY_SIZE(i915_query_funcs))
+               ret = -EINVAL;
+               if (func_idx < ARRAY_SIZE(i915_query_funcs)) {
+                       func_idx = array_index_nospec(func_idx,
+                                                     ARRAY_SIZE(i915_query_funcs));
                        ret = i915_query_funcs[func_idx](dev_priv, &item);
-               else
-                       ret = -EINVAL;
+               }
 
                /* Only write the length back to userspace if they differ. */
                if (ret != item.length && put_user(ret, &user_item_ptr->length))