[Intel-gfx] [PATCH v2] drm/i915: Fix potential spectre vulnerability

[Kunwu Chan]

Fix smatch warning:
drivers/gpu/drm/i915/gem/i915_gem_context.c:847 set_proto_ctx_sseu()
warn: potential spectre issue 'pc->user_engines' [r] (local cap)

Fixes: d4433c7600f7 ("drm/i915/gem: Use the proto-context to handle create 
parameters (v5)")
Cc: <sta...@vger.kernel.org> # v5.15+
Signed-off-by: Kunwu Chan <chen...@kylinos.cn>
Suggested-by: Tvrtko Ursulin <tvrtko.ursu...@linux.intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursu...@linux.intel.com>
Link: https://lore.kernel.org/all/20231102101642.52988-1-chen...@kylinos.cn
---
 drivers/gpu/drm/i915/gem/i915_gem_context.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context.c 
b/drivers/gpu/drm/i915/gem/i915_gem_context.c
index 9a9ff84c90d7..e38f06a6e56e 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_context.c
@@ -844,6 +844,7 @@ static int set_proto_ctx_sseu(struct drm_i915_file_private 
*fpriv,
                if (idx >= pc->num_user_engines)
                        return -EINVAL;
 
+               idx = array_index_nospec(idx, pc->num_user_engines);
                pe = &pc->user_engines[idx];
 
                /* Only render engine supports RPCS configuration. */
-- 
2.34.1