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drm/i915/gem: Add missing nospec on parallel submit slot

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Add missing Spectre mitigation for userspace controlled parallel
submission slot.

Discovered using AI-assisted static analysis confirmed by Intel
Product Security.

Reported-by: Martin Hodo <martin.hodo@intel.com>
Fixes: e5e32171a2 ("drm/i915/guc: Connect UAPI to GuC multi-lrc interface")
Cc: Matthew Brost <matthew.brost@intel.com>
Cc: Tvrtko Ursulin <tursulin@ursulin.net>
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Reviewed-by: Matthew Brost <matthew.brost@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@igalia.com>
Cc: <stable@vger.kernel.org> # v5.16+
Link: https://patch.msgid.link/20260622132539.165558-1-joonas.lahtinen@linux.intel.com
(cherry picked from commit 15b9353deff3cf72331c387780de3cf9c316b643)
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
This commit is contained in:
Joonas Lahtinen 2026-06-22 16:25:39 +03:00
parent 062499cc48
commit 914a76a9f0
1 changed files with 1 additions and 0 deletions
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1
drivers/gpu/drm/i915/gem/i915_gem_context.c
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@ -613,6 +613,7 @@ set_proto_ctx_engines_parallel_submit(struct i915_user_extension __user *base,
return -EINVAL;
}
slot = array_index_nospec(slot, set->num_engines);
if (set->engines[slot].type != I915_GEM_ENGINE_TYPE_INVALID) {
drm_dbg(&i915->drm,
"Invalid placement[%d], already occupied\n", slot);