From: Jani Nikula jani.nikula@intel.com
commit 24a644ebbfd3b13cda702f98907f9dd123e34bf9 upstream.
The mapping from enum port to whatever port numbering scheme is used by the SWSCI Display Power State Notification is odd, and the memory of it has faded. In any case, the parameter only has space for ports numbered [0..4], and UBSAN reports bit shift beyond it when the platform has port F or more.
Since the SWSCI functionality is supposed to be obsolete for new platforms (i.e. ones that might have port F or more), just bail out early if the mapped and mangled port number is beyond what the Display Power State Notification can support.
Fixes: 9c4b0a683193 ("drm/i915: add opregion function to notify bios of encoder enable/disable") Cc: stable@vger.kernel.org # v3.13+ Cc: Ville Syrjälä ville.syrjala@linux.intel.com Cc: Lucas De Marchi lucas.demarchi@intel.com Closes: https://gitlab.freedesktop.org/drm/intel/-/issues/4800 Signed-off-by: Jani Nikula jani.nikula@intel.com Reviewed-by: Ville Syrjälä ville.syrjala@linux.intel.com Link: https://patchwork.freedesktop.org/patch/msgid/cc363f42d6b5a5932b6d218fefcc8b... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/gpu/drm/i915/display/intel_opregion.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+)
--- a/drivers/gpu/drm/i915/display/intel_opregion.c +++ b/drivers/gpu/drm/i915/display/intel_opregion.c @@ -375,6 +375,21 @@ int intel_opregion_notify_encoder(struct return -EINVAL; }
+ /* + * The port numbering and mapping here is bizarre. The now-obsolete + * swsci spec supports ports numbered [0..4]. Port E is handled as a + * special case, but port F and beyond are not. The functionality is + * supposed to be obsolete for new platforms. Just bail out if the port + * number is out of bounds after mapping. + */ + if (port > 4) { + drm_dbg_kms(&dev_priv->drm, + "[ENCODER:%d:%s] port %c (index %u) out of bounds for display power state notification\n", + intel_encoder->base.base.id, intel_encoder->base.name, + port_name(intel_encoder->port), port); + return -EINVAL; + } + if (!enable) parm |= 4 << 8;