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: a446ae2c ("drm/i915: add query uAPI") Signed-off-by: NChris 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: NLionel Landwerlin <lionel.g.landwerlin@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20180521210530.26008-1-chris@chris-wilson.co.uk
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