drm/i915/gem: Fix NULL deref in I915_CONTEXT_PARAM_SSEU

commit 2b56757 upstream.

Setting context engine slot N into I915_ENGINE_CLASS_INVALID /
I915_ENGINE_CLASS_INVALID_NONE and attempting to apply
I915_CONTEXT_PARAM_SSEU to the same slot N will deref NULL.
Fix that.

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

Reported-by: Martin Hodo <martin.hodo@intel.com>
Fixes: d4433c7 ("drm/i915/gem: Use the proto-context to handle create parameters (v5)")
Cc: Faith Ekstrand <faith.ekstrand@collabora.com>
Cc: Simona Vetter <simona.vetter@ffwll.ch>
Cc: Tvrtko Ursulin <tvrtko.ursulin@igalia.com>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: <stable@vger.kernel.org> # v5.15+
Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reviewed-by: Andi Shyti <andi.shyti@linux.intel.com>
Link: https://patch.msgid.link/20260701075555.52142-1-joonas.lahtinen@linux.intel.com
(cherry picked from commit 36eda5b)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Author: jlahtine-intel

drivers/gpu/drm/i915/gem/i915_gem_context.c

@@ -855,7 +855,7 @@ static int set_proto_ctx_sseu(struct drm_i915_file_private *fpriv,
 		pe = &pc->user_engines[idx];
 
 		/* Only render engine supports RPCS configuration. */
-		if (pe->engine->class != RENDER_CLASS)
+		if (!pe->engine || pe->engine->class != RENDER_CLASS)
 			return -EINVAL;
 
 		sseu = &pe->sseu;